public final class DjvuImage extends RasterImage
DjvuDocument class
This example shows how to load a DJVU image from a file stream.
String dir = "c:\\temp\\"; // Load a DJVU image from a file stream. java.io.InputStream stream = new java.io.FileInputStream(dir + "sample.djvu"); com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = new com.aspose.imaging.fileformats.djvu.DjvuImage(stream); try { // Save each page as an individual PNG image. for (com.aspose.imaging.fileformats.djvu.DjvuPage djvuPage : djvuImage.getPages()) { // Generate a file name based on the page number. String fileName = String.format("sample.%s.png", djvuPage.getPageNumber()); djvuPage.save(dir + fileName, new com.aspose.imaging.imageoptions.PngOptions()); } } finally { djvuImage.dispose(); stream.close(); }
Modifier and Type | Field and Description |
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com.aspose.ms.lang.Event<com.aspose.ms.System.ComponentModel.PropertyChangedEventHandler> |
PropertyChanged |
Constructor and Description |
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DjvuImage(InputStream stream)
Initializes a new instance of the
DjvuImage class. |
DjvuImage(InputStream stream,
LoadOptions loadOptions)
Initializes a new instance of the
DjvuImage class. |
DjvuImage(com.aspose.ms.System.IO.Stream stream,
LoadOptions loadOptions) |
Modifier and Type | Method and Description |
---|---|
void |
adjustBrightness(int brightness)
Adjust of a brightness for image.
|
void |
adjustContrast(float contrast)
Image contrasting
|
void |
adjustGamma(float gamma)
Gamma-correction of an image.
|
void |
adjustGamma(float gammaRed,
float gammaGreen,
float gammaBlue)
Gamma-correction of an image.
|
void |
binarizeBradley(double brightnessDifference)
Binarization of an image using Bradley's adaptive thresholding algorithm using the integral image thresholding
|
void |
binarizeBradley(double brightnessDifference,
int windowSize)
Binarization of an image using Bradley's adaptive thresholding algorithm using the integral image thresholding
|
void |
binarizeFixed(byte threshold)
Binarization of an image with predefined threshold
|
void |
binarizeOtsu()
Binarization of an image with Otsu thresholding
|
void |
cacheData()
Caches the data and ensures no additional data loading will be performed from the underlying
DataStreamSupporter.DataStreamContainer . |
void |
crop(Rectangle rectangle)
Cropping the image.
|
void |
dither(int ditheringMethod,
int bitsCount,
IColorPalette customPalette)
Performs dithering on the current image.
|
void |
filter(Rectangle rectangle,
FilterOptionsBase options)
Filters the specified rectangle.
|
DjvuPage |
getActivePage()
Gets or sets the currently active page
|
int |
getBitsPerPixel()
Gets the image bits per pixel count.
|
long |
getFileFormat()
Gets a value of file format
|
DjvuPage |
getFirstPage()
Gets the first page of the document
|
int |
getHeight()
Gets the image height.
|
int |
getIdentifier()
Gets the unique identifier for the document
|
float |
getImageOpacity()
Gets opacity of this image.
|
DjvuPage |
getLastPage()
Gets the last page of the document
|
DjvuPage |
getNextPage()
Gets the next page of the document
|
DjvuPage[] |
getPages()
Gets the pages for the document
|
DjvuPage |
getPreviousPage()
Gets the previous page of the document
|
int |
getWidth()
Gets the image width.
|
void |
grayscale()
Transformation of an image to its grayscale representation
|
boolean |
isCached()
Gets a value indicating whether object's data is cached currently and no data readig is required.
|
static DjvuImage |
loadDocument(InputStream stream)
Loads the document.
|
static DjvuImage |
loadDocument(InputStream stream,
LoadOptions loadOptions)
Loads the document.
|
void |
normalizeAngle(boolean resizeProportionally,
Color backgroundColor)
Normalizes the angle.
|
void |
replaceColor(int oldColorArgb,
byte oldColorDiff,
int newColorArgb)
Replaces one color to another with allowed difference and preserves original alpha value to save smooth edges.
|
void |
replaceNonTransparentColors(int newColorArgb)
Replaces all non-transparent colors with new color and preserves original alpha value to save smooth edges.
|
void |
resize(int newWidth,
int newHeight,
ImageResizeSettings settings)
Resizes the image with extended options.
|
void |
resize(int newWidth,
int newHeight,
int resizeType)
Resizes the image.
|
void |
resizeHeightProportionally(int newHeight,
int resizeType)
Resizes the height proportionally.
|
void |
resizeWidthProportionally(int newWidth,
int resizeType)
Resizes the width proportionally.
|
void |
rotate(float angle,
boolean resizeProportionally,
Color backgroundColor)
Rotate image around the center.
|
void |
rotateFlip(int rotateFlipType)
Rotates, flips, or rotates and flips the Active frame only.
|
void |
rotateFlipAll(int rotateFlip)
Rotates the flip all frames in image.
|
void |
setActivePage(DjvuPage value)
Gets or sets the currently active page
|
crop, dither, getArgb32Pixel, getDefaultArgb32Pixels, getDefaultPixels, getDefaultRawData, getDefaultRawData, getHorizontalResolution, getModifyDate, getPixel, getPremultiplyComponents, getRawCustomColorConverter, getRawDataFormat, getRawDataSettings, getRawFallbackIndex, getRawIndexedColorConverter, getRawLineSize, getSkewAngle, getTransparentColor, getUpdateXmpData, getUseRawData, getVerticalResolution, getXmpData, hasAlpha, hasTransparentColor, isRawDataAvailable, loadArgb32Pixels, loadArgb64Pixels, loadCmyk32Pixels, loadCmykPixels, loadPartialArgb32Pixels, loadPartialPixels, loadPixels, loadRawData, loadRawData, normalizeAngle, readArgb32ScanLine, readScanLine, replaceColor, replaceNonTransparentColors, rotate, saveArgb32Pixels, saveCmyk32Pixels, saveCmykPixels, savePixels, saveRawData, setArgb32Pixel, setHorizontalResolution, setPalette, setPixel, setPremultiplyComponents, setRawCustomColorConverter, setRawFallbackIndex, setRawIndexedColorConverter, setResolution, setTransparentColor, setTransparentColor, setUpdateXmpData, setUseRawData, setVerticalResolution, setXmpData, toBitmap, writeArgb32ScanLine, writeScanLine
canLoad, canLoad, canLoad, canLoad, canSave, create, getBackgroundColor, getBounds, getBufferSizeHint, getContainer, getDefaultOptions, getFileFormat, getFileFormat, getFittingRectangle, getFittingRectangle, getInterruptMonitor, getOriginalOptions, getPalette, getProportionalHeight, getProportionalWidth, getSize, hasBackgroundColor, isAutoAdjustPalette, load, load, load, load, load, load, resize, resizeHeightProportionally, resizeHeightProportionally, resizeWidthProportionally, resizeWidthProportionally, save, save, save, save, save, save, save, setAutoAdjustPalette, setBackgroundColor, setBackgroundColor, setBufferSizeHint, setInterruptMonitor, setPalette
getDataStreamContainer, save, save, save, save
close, dispose, getDisposed
public final com.aspose.ms.lang.Event<com.aspose.ms.System.ComponentModel.PropertyChangedEventHandler> PropertyChanged
public DjvuImage(InputStream stream)
Initializes a new instance of the DjvuImage
class.
stream
- The stream.DjvuImageException
- Stream is emptyThis example shows how to load a DJVU image from a file stream.
String dir = "c:\\temp\\"; // Load a DJVU image from a file stream. java.io.InputStream stream = new java.io.FileInputStream(dir + "sample.djvu"); com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = new com.aspose.imaging.fileformats.djvu.DjvuImage(stream); try { // Save each page as an individual PNG image. for (com.aspose.imaging.fileformats.djvu.DjvuPage djvuPage : djvuImage.getPages()) { // Generate a file name based on the page number. String fileName = String.format("sample.%s.png", djvuPage.getPageNumber()); djvuPage.save(dir + fileName, new com.aspose.imaging.imageoptions.PngOptions()); } } finally { djvuImage.dispose(); stream.close(); }
public DjvuImage(InputStream stream, LoadOptions loadOptions)
Initializes a new instance of the DjvuImage
class.
stream
- The stream to load from.loadOptions
- The load options.DjvuImageException
- Stream is emptyThis example shows how to load a DJVU image from a file stream to stay within the specified memory limit.
String dir = "c:\\temp\\"; // Load a DJVU image from a file stream. java.io.InputStream stream = new java.io.FileInputStream(dir + "sample.djvu"); try { // The max allowed size for all internal buffers is 1MB. com.aspose.imaging.LoadOptions loadOptions = new com.aspose.imaging.LoadOptions(); loadOptions.setBufferSizeHint(1 * 1024 * 1024); com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = new com.aspose.imaging.fileformats.djvu.DjvuImage(stream, loadOptions); try { // Save each page as an individual PNG image. for (com.aspose.imaging.fileformats.djvu.DjvuPage djvuPage : djvuImage.getPages()) { // Generate a file name based on the page number. String fileName = String.format("sample.%s.png", djvuPage.getPageNumber()); djvuPage.save(dir + fileName, new com.aspose.imaging.imageoptions.PngOptions()); } } finally { djvuImage.dispose(); } } finally { stream.close(); }
public DjvuImage(com.aspose.ms.System.IO.Stream stream, LoadOptions loadOptions)
public int getIdentifier()
Gets the unique identifier for the document
public DjvuPage[] getPages()
Gets the pages for the document
This example shows how to load a DJVU image from a file stream.
String dir = "c:\\temp\\"; // Load a DJVU image from a file stream. java.io.InputStream stream = new java.io.FileInputStream(dir + "sample.djvu"); com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = new com.aspose.imaging.fileformats.djvu.DjvuImage(stream); try { // Save each page as an individual PNG image. for (com.aspose.imaging.fileformats.djvu.DjvuPage djvuPage : djvuImage.getPages()) { // Generate a file name based on the page number. String fileName = String.format("sample.%s.png", djvuPage.getPageNumber()); djvuPage.save(dir + fileName, new com.aspose.imaging.imageoptions.PngOptions()); } } finally { djvuImage.dispose(); stream.close(); }
public DjvuPage getActivePage()
Gets or sets the currently active page
DjvuImageException
- There is no active page selected.This example shows how to load a DJVU image from a file stream and print information about the pages.
String dir = "c:\\temp\\"; // Load a DJVU image from a file stream. java.io.FileInputStream stream = new java.io.FileInputStream(dir + "sample.djvu"); try { com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = new com.aspose.imaging.fileformats.djvu.DjvuImage(stream); try { System.out.println("The total number of pages: " + djvuImage.getPages().length); System.out.println("The active page number: " + djvuImage.getActivePage().getPageNumber()); System.out.println("The first page number: " + djvuImage.getFirstPage().getPageNumber()); System.out.println("The last page number: " + djvuImage.getLastPage().getPageNumber()); for (com.aspose.imaging.fileformats.djvu.DjvuPage djvuPage : djvuImage.getPages()) { System.out.println("--------------------------------------------------"); System.out.println("Page number: " + djvuPage.getPageNumber()); System.out.println("Page size: " + djvuPage.getSize()); System.out.println("Page raw format: " + djvuPage.getRawDataFormat()); } } finally { djvuImage.dispose(); } } finally { stream.close(); } //The output may look like this: //The total number of pages: 2 //The active page number: 1 //The first page number: 1 //The last page number: 2 //-------------------------------------------------- //Page number: 1 //Page size: { Width = 2481, Height = 3508} //Page raw format: RgbIndexed1Bpp, used channels: 1 //-------------------------------------------------- //Page number: 2 //Page size: { Width = 2481, Height = 3508} //Page raw format: RgbIndexed1Bpp, used channels: 1
public void setActivePage(DjvuPage value)
Gets or sets the currently active page
value
- The active page.DjvuImageException
- When the active page cannot be set as it belongs to another image.public DjvuPage getFirstPage()
Gets the first page of the document
DjvuImageException
- The first page can not be foundThis example shows how to load a DJVU image from a file stream and print information about the pages.
String dir = "c:\\temp\\"; // Load a DJVU image from a file stream. java.io.FileInputStream stream = new java.io.FileInputStream(dir + "sample.djvu"); try { com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = new com.aspose.imaging.fileformats.djvu.DjvuImage(stream); try { System.out.println("The total number of pages: " + djvuImage.getPages().length); System.out.println("The active page number: " + djvuImage.getActivePage().getPageNumber()); System.out.println("The first page number: " + djvuImage.getFirstPage().getPageNumber()); System.out.println("The last page number: " + djvuImage.getLastPage().getPageNumber()); for (com.aspose.imaging.fileformats.djvu.DjvuPage djvuPage : djvuImage.getPages()) { System.out.println("--------------------------------------------------"); System.out.println("Page number: " + djvuPage.getPageNumber()); System.out.println("Page size: " + djvuPage.getSize()); System.out.println("Page raw format: " + djvuPage.getRawDataFormat()); } } finally { djvuImage.dispose(); } } finally { stream.close(); } //The output may look like this: //The total number of pages: 2 //The active page number: 1 //The first page number: 1 //The last page number: 2 //-------------------------------------------------- //Page number: 1 //Page size: { Width = 2481, Height = 3508} //Page raw format: RgbIndexed1Bpp, used channels: 1 //-------------------------------------------------- //Page number: 2 //Page size: { Width = 2481, Height = 3508} //Page raw format: RgbIndexed1Bpp, used channels: 1
public DjvuPage getLastPage()
Gets the last page of the document
DjvuImageException
- The last page can not be foundThis example shows how to load a DJVU image from a file stream and print information about the pages.
String dir = "c:\\temp\\"; // Load a DJVU image from a file stream. java.io.FileInputStream stream = new java.io.FileInputStream(dir + "sample.djvu"); try { com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = new com.aspose.imaging.fileformats.djvu.DjvuImage(stream); try { System.out.println("The total number of pages: " + djvuImage.getPages().length); System.out.println("The active page number: " + djvuImage.getActivePage().getPageNumber()); System.out.println("The first page number: " + djvuImage.getFirstPage().getPageNumber()); System.out.println("The last page number: " + djvuImage.getLastPage().getPageNumber()); for (com.aspose.imaging.fileformats.djvu.DjvuPage djvuPage : djvuImage.getPages()) { System.out.println("--------------------------------------------------"); System.out.println("Page number: " + djvuPage.getPageNumber()); System.out.println("Page size: " + djvuPage.getSize()); System.out.println("Page raw format: " + djvuPage.getRawDataFormat()); } } finally { djvuImage.dispose(); } } finally { stream.close(); } //The output may look like this: //The total number of pages: 2 //The active page number: 1 //The first page number: 1 //The last page number: 2 //-------------------------------------------------- //Page number: 1 //Page size: { Width = 2481, Height = 3508} //Page raw format: RgbIndexed1Bpp, used channels: 1 //-------------------------------------------------- //Page number: 2 //Page size: { Width = 2481, Height = 3508} //Page raw format: RgbIndexed1Bpp, used channels: 1
public DjvuPage getNextPage()
Gets the next page of the document
DjvuImageException
- The next page can not be foundpublic DjvuPage getPreviousPage()
Gets the previous page of the document
DjvuImageException
- The previous page can not be foundpublic int getBitsPerPixel()
Gets the image bits per pixel count.
getBitsPerPixel
in class Image
public int getHeight()
Gets the image height.
getHeight
in interface IObjectWithBounds
getHeight
in class Image
public int getWidth()
Gets the image width.
getWidth
in interface IObjectWithBounds
getWidth
in class Image
public final boolean isCached()
Gets a value indicating whether object's data is cached currently and no data readig is required.
isCached
in class DataStreamSupporter
true
if object's data is cached; otherwise, false
.public float getImageOpacity()
Gets opacity of this image. 0 = fully transparent, 1 = fully opaque.
getImageOpacity
in class RasterImage
public long getFileFormat()
Gets a value of file format
getFileFormat
in class Image
public static DjvuImage loadDocument(InputStream stream)
Loads the document.
stream
- The stream.public static DjvuImage loadDocument(InputStream stream, LoadOptions loadOptions)
Loads the document.
stream
- The stream.loadOptions
- The load options.public void resize(int newWidth, int newHeight, int resizeType)
Resizes the image.
resize
in class RasterImage
newWidth
- The new width.newHeight
- The new height.resizeType
- The resize type.This example loads a DJVU image and resizes it using various resizing methods.
String dir = "c:\\temp\\"; com.aspose.imaging.fileformats.djvu.DjvuImage image = (com.aspose.imaging.fileformats.djvu.DjvuImage) com.aspose.imaging.Image.load(dir + "sample.djvu"); try { // Scale up by 2 times using Nearest Neighbour resampling. image.resize(image.getWidth() * 2, image.getHeight() * 2, com.aspose.imaging.ResizeType.NearestNeighbourResample); // Save to PNG with default options. image.save(dir + "upsample.nearestneighbour.png", new com.aspose.imaging.imageoptions.PngOptions()); } finally { image.dispose(); } image = (com.aspose.imaging.fileformats.djvu.DjvuImage) com.aspose.imaging.Image.load(dir + "sample.djvu"); try { // Scale down by 2 times using Nearest Neighbour resampling. image.resize(image.getWidth() / 2, image.getHeight() / 2, com.aspose.imaging.ResizeType.NearestNeighbourResample); // Save to PNG with default options. image.save(dir + "downsample.nearestneighbour.png", new com.aspose.imaging.imageoptions.PngOptions()); } finally { image.dispose(); } image = (com.aspose.imaging.fileformats.djvu.DjvuImage) com.aspose.imaging.Image.load(dir + "sample.djvu"); try { // Scale up by 2 times using Bilinear resampling. image.resize(image.getWidth() * 2, image.getHeight() * 2, com.aspose.imaging.ResizeType.BilinearResample); // Save to PNG with default options. image.save(dir + "upsample.bilinear.png", new com.aspose.imaging.imageoptions.PngOptions()); } finally { image.dispose(); } image = (com.aspose.imaging.fileformats.djvu.DjvuImage) com.aspose.imaging.Image.load(dir + "sample.djvu"); try { // Scale down by 2 times using Bilinear resampling. image.resize(image.getWidth() / 2, image.getHeight() / 2, com.aspose.imaging.ResizeType.BilinearResample); // Save to PNG with default options. image.save(dir + "downsample.bilinear.png", new com.aspose.imaging.imageoptions.PngOptions()); } finally { image.dispose(); }
public void resize(int newWidth, int newHeight, ImageResizeSettings settings)
Resizes the image with extended options.
resize
in class RasterImage
newWidth
- The new width.newHeight
- The new height.settings
- The resize settings.This example loads a DJVU image and resizes it using various resizing settings.
String dir = "c:\\temp\\"; com.aspose.imaging.ImageResizeSettings resizeSettings = new com.aspose.imaging.ImageResizeSettings(); // The adaptive algorithm based on weighted and blended rational function and lanczos3 interpolation. resizeSettings.setMode(com.aspose.imaging.ResizeType.AdaptiveResample); // The small rectangular filter resizeSettings.setFilterType(com.aspose.imaging.ImageFilterType.SmallRectangular); // The number of colors in the palette. resizeSettings.setEntriesCount(256); // The color quantization is not used resizeSettings.setColorQuantizationMethod(com.aspose.imaging.ColorQuantizationMethod.None); // The euclidian method resizeSettings.setColorCompareMethod(com.aspose.imaging.ColorCompareMethod.Euclidian); com.aspose.imaging.Image image = (com.aspose.imaging.Image) com.aspose.imaging.Image.load(dir + "sample.djvu"); try { com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image; // Scale down by 2 times using adaptive resampling. djvuImage.resize(image.getWidth() / 2, image.getHeight() / 2, resizeSettings); // Save to PNG djvuImage.save(dir + "downsample.adaptive.png", new com.aspose.imaging.imageoptions.PngOptions()); } finally { image.dispose(); }
public void resizeHeightProportionally(int newHeight, int resizeType)
Resizes the height proportionally.
resizeHeightProportionally
in class Image
newHeight
- The new height.resizeType
- Type of the resize.This example loads a DJVU image and resizes it proportionally using various resizing methods. Only the height is specified, the width is calculated automatically.
String dir = "c:\\temp\\"; com.aspose.imaging.fileformats.djvu.DjvuImage image = (com.aspose.imaging.fileformats.djvu.DjvuImage) com.aspose.imaging.Image.load(dir + "sample.djvu"); try { // Scale up by 2 times using Nearest Neighbour resampling. image.resizeHeightProportionally(image.getHeight() * 2, com.aspose.imaging.ResizeType.NearestNeighbourResample); // Save to PNG with the default options. image.save(dir + "upsample.nearestneighbour.png", new com.aspose.imaging.imageoptions.PngOptions()); } finally { image.dispose(); } image = (com.aspose.imaging.fileformats.djvu.DjvuImage) com.aspose.imaging.Image.load(dir + "sample.djvu"); try { // Scale down by 2 times using Nearest Neighbour resampling. image.resizeHeightProportionally(image.getHeight() / 2, com.aspose.imaging.ResizeType.NearestNeighbourResample); // Save to PNG with the default options. image.save(dir + "downsample.nearestneighbour.png", new com.aspose.imaging.imageoptions.PngOptions()); } finally { image.dispose(); } image = (com.aspose.imaging.fileformats.djvu.DjvuImage) com.aspose.imaging.Image.load(dir + "sample.djvu"); try { // Scale up by 2 times using Bilinear resampling. image.resizeHeightProportionally(image.getHeight() * 2, com.aspose.imaging.ResizeType.BilinearResample); // Save to PNG with the default options. image.save(dir + "upsample.bilinear.png", new com.aspose.imaging.imageoptions.PngOptions()); } finally { image.dispose(); } image = (com.aspose.imaging.fileformats.djvu.DjvuImage) com.aspose.imaging.Image.load(dir + "sample.djvu"); try { // Scale down by 2 times using Bilinear resampling. image.resizeHeightProportionally(image.getHeight() / 2, com.aspose.imaging.ResizeType.BilinearResample); // Save to PNG with the default options. image.save(dir + "downsample.bilinear.png", new com.aspose.imaging.imageoptions.PngOptions()); } finally { image.dispose(); }
public void resizeWidthProportionally(int newWidth, int resizeType)
Resizes the width proportionally.
resizeWidthProportionally
in class Image
newWidth
- The new width.resizeType
- Type of the resize.This example loads a DJVU image and resizes it proportionally using various resizing methods. Only the width is specified, the height is calculated automatically.
String dir = "c:\\temp\\"; com.aspose.imaging.fileformats.djvu.DjvuImage image = (com.aspose.imaging.fileformats.djvu.DjvuImage) com.aspose.imaging.Image.load(dir + "sample.djvu"); try { // Scale up by 2 times using Nearest Neighbour resampling. image.resizeWidthProportionally(image.getWidth() * 2, com.aspose.imaging.ResizeType.NearestNeighbourResample); // Save to PNG with the default options. image.save(dir + "upsample.nearestneighbour.png", new com.aspose.imaging.imageoptions.PngOptions()); } finally { image.dispose(); } image = (com.aspose.imaging.fileformats.djvu.DjvuImage) com.aspose.imaging.Image.load(dir + "sample.djvu"); try { // Scale down by 2 times using Nearest Neighbour resampling. image.resizeWidthProportionally(image.getWidth() / 2, com.aspose.imaging.ResizeType.NearestNeighbourResample); // Save to PNG with the default options. image.save(dir + "downsample.nearestneighbour.png", new com.aspose.imaging.imageoptions.PngOptions()); } finally { image.dispose(); } image = (com.aspose.imaging.fileformats.djvu.DjvuImage) com.aspose.imaging.Image.load(dir + "sample.djvu"); try { // Scale up by 2 times using Bilinear resampling. image.resizeWidthProportionally(image.getWidth() * 2, com.aspose.imaging.ResizeType.BilinearResample); // Save to PNG with the default options. image.save(dir + "upsample.bilinear.png", new com.aspose.imaging.imageoptions.PngOptions()); } finally { image.dispose(); } image = (com.aspose.imaging.fileformats.djvu.DjvuImage) com.aspose.imaging.Image.load(dir + "sample.djvu"); try { // Scale down by 2 times using Bilinear resampling. image.resizeWidthProportionally(image.getWidth() / 2, com.aspose.imaging.ResizeType.BilinearResample); // Save to PNG with the default options. image.save(dir + "downsample.bilinear.png", new com.aspose.imaging.imageoptions.PngOptions()); } finally { image.dispose(); }
public void crop(Rectangle rectangle)
Cropping the image.
crop
in class RasterImage
rectangle
- The rectangle.The following example crops a DJVU image. The cropping area is be specified via Aspose.Imaging.Rectangle.
String dir = "c:\\temp\\"; com.aspose.imaging.Image image = com.aspose.imaging.Image.load(dir + "sample.djvu"); try { com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image; // Crop the image. The cropping area is the rectangular central area of the image. com.aspose.imaging.Rectangle area = new com.aspose.imaging.Rectangle( djvuImage.getWidth() / 4, djvuImage.getHeight() / 4, djvuImage.getWidth() / 2, djvuImage.getHeight() / 2); djvuImage.crop(area); // Save the cropped image to PNG djvuImage.save(dir + "sample.Crop.png", new com.aspose.imaging.imageoptions.PngOptions()); } finally { image.dispose(); }
public void rotateFlip(int rotateFlipType)
Rotates, flips, or rotates and flips the Active frame only.
rotateFlip
in class Image
rotateFlipType
- The rotate flip type.This example loads a DJVU image, rotates it by 90 degrees clockwise and optionally flips the image horizontally and(or) vertically.
String dir = "c:\\temp\\"; int[] rotateFlipTypes = new int[] { com.aspose.imaging.RotateFlipType.Rotate90FlipNone, com.aspose.imaging.RotateFlipType.Rotate90FlipX, com.aspose.imaging.RotateFlipType.Rotate90FlipXY, com.aspose.imaging.RotateFlipType.Rotate90FlipY, }; for (int rotateFlipType : rotateFlipTypes) { // Rotate, flip and save to the output file. com.aspose.imaging.fileformats.djvu.DjvuImage image = (com.aspose.imaging.fileformats.djvu.DjvuImage) com.aspose.imaging.Image.load(dir + "sample.djvu"); try { image.rotateFlip(rotateFlipType); image.save(dir + "sample." + rotateFlipType + ".png", new com.aspose.imaging.imageoptions.PngOptions()); } finally { image.dispose(); } }
public void grayscale()
Transformation of an image to its grayscale representation
grayscale
in class RasterImage
The following example transforms a colored DJVU image to its grayscale representation. Grayscale images are composed exclusively of shades of gray and carry only intensity information.
String dir = "c:\\temp\\"; com.aspose.imaging.Image image = com.aspose.imaging.Image.load(dir + "sample.djvu"); try { com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image; djvuImage.grayscale(); djvuImage.save(dir + "sample.Grayscale.png", new com.aspose.imaging.imageoptions.PngOptions()); } finally { image.dispose(); }
public void binarizeFixed(byte threshold)
Binarization of an image with predefined threshold
binarizeFixed
in class RasterImage
threshold
- Threshold value. If corresponding gray value of a pixel is greater than threshold, a value of 255 will be assigned to it, 0 otherwise.The following example binarizes a DJVU image with the predefined threshold. Binarized images contain only 2 colors - black and white.
String dir = "c:\\temp\\"; com.aspose.imaging.Image image = com.aspose.imaging.Image.load(dir + "sample.djvu"); try { com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image; // Binarize the image with a threshold value of 127. // If a corresponding gray value of a pixel is greater than 127, a value of 255 will be assigned to it, 0 otherwise. djvuImage.binarizeFixed((byte) 127); djvuImage.save(dir + "sample.BinarizeFixed.png", new com.aspose.imaging.imageoptions.PngOptions()); } finally { image.dispose(); }
public void binarizeOtsu()
Binarization of an image with Otsu thresholding
binarizeOtsu
in class RasterImage
The following example binarizes a DJVU image with Otsu thresholding. Binarized images contain only 2 colors - black and white.
String dir = "c:\\temp\\"; com.aspose.imaging.Image image = com.aspose.imaging.Image.load(dir + "sample.djvu"); try { com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image; // Binarize the image with Otsu thresholding. djvuImage.binarizeOtsu(); djvuImage.save(dir + "sample.BinarizeOtsu.png", new com.aspose.imaging.imageoptions.PngOptions()); } finally { image.dispose(); }
public void binarizeBradley(double brightnessDifference, int windowSize)
Binarization of an image using Bradley's adaptive thresholding algorithm using the integral image thresholding
binarizeBradley
in class RasterImage
brightnessDifference
- The brightness difference between pixel and the average of an s x s window of pixels centered around this pixel.windowSize
- The size of s x s window of pixels centered around this pixelThe following example binarizes a DJVU image with Bradley's adaptive thresholding algorithm with the specified window size. Binarized images contain only 2 colors - black and white.
String dir = "c:\\temp\\"; com.aspose.imaging.Image image = com.aspose.imaging.Image.load(dir + "sample.djvu"); try { com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image; // Binarize the image with a brightness difference of 5. The brightness is a difference between a pixel and the average of an 10 x 10 window of pixels centered around this pixel. djvuImage.binarizeBradley(5, 10); djvuImage.save(dir + "sample.BinarizeBradley5_10x10.png", new com.aspose.imaging.imageoptions.PngOptions()); } finally { image.dispose(); }
public void binarizeBradley(double brightnessDifference)
Binarization of an image using Bradley's adaptive thresholding algorithm using the integral image thresholding
binarizeBradley
in class RasterImage
brightnessDifference
- The brightness difference between pixel and the average of an s x s window of pixels centered around this pixel.public void adjustBrightness(int brightness)
Adjust of a brightness for image.
adjustBrightness
in class RasterImage
brightness
- Brightness value.The following example performs brightness correction of a DJVU image.
String dir = "c:\\temp\\"; com.aspose.imaging.Image image = com.aspose.imaging.Image.load(dir + "sample.djvu"); try { com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image; // Set the brightness value. The accepted values of brightness are in the range [-255, 255]. djvuImage.adjustBrightness(50); djvuImage.save(dir + "sample.AdjustBrightness.png", new com.aspose.imaging.imageoptions.PngOptions()); } finally { image.dispose(); }
public void adjustContrast(float contrast)
Image contrasting
adjustContrast
in class RasterImage
contrast
- Contrast value (in range [-100; 100])The following example performs contrast correction of a DJVU image.
String dir = "c:\\temp\\"; com.aspose.imaging.Image image = com.aspose.imaging.Image.load(dir + "sample.djvu"); try { com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image; // Set the contrast value. The accepted values of contrast are in the range [-100f, 100f]. djvuImage.adjustContrast(50f); djvuImage.save(dir + "sample.AdjustContrast.png", new com.aspose.imaging.imageoptions.PngOptions()); } finally { image.dispose(); }
public void adjustGamma(float gammaRed, float gammaGreen, float gammaBlue)
Gamma-correction of an image.
adjustGamma
in class RasterImage
gammaRed
- Gamma for red channel coefficientgammaGreen
- Gamma for green channel coefficientgammaBlue
- Gamma for blue channel coefficientThe following example performs gamma-correction of a DJVU image applying different coefficients for color components.
String dir = "c:\\temp\\"; com.aspose.imaging.Image image = com.aspose.imaging.Image.load(dir + "sample.djvu"); try { com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image; // Set individual gamma coefficients for red, green and blue channels. djvuImage.adjustGamma(1.5f, 2.5f, 3.5f); djvuImage.save(dir + "sample.AdjustGamma.png", new com.aspose.imaging.imageoptions.PngOptions()); } finally { image.dispose(); }
public void adjustGamma(float gamma)
Gamma-correction of an image.
adjustGamma
in class RasterImage
gamma
- Gamma for red, green and blue channels coefficientThe following example performs gamma-correction of a DJVU image.
String dir = "c:\\temp\\"; com.aspose.imaging.Image image = com.aspose.imaging.Image.load(dir + "sample.djvu"); try { com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image; // Set gamma coefficient for red, green and blue channels. djvuImage.adjustGamma(2.5f); djvuImage.save(dir + "sample.AdjustGamma.png", new com.aspose.imaging.imageoptions.PngOptions()); } finally { image.dispose(); }
public void rotateFlipAll(int rotateFlip)
Rotates the flip all frames in image.
rotateFlip
- The rotate flip type.public void rotate(float angle, boolean resizeProportionally, Color backgroundColor)
Rotate image around the center.
rotate
in class RasterImage
angle
- The rotate angle in degrees. Positive values will rotate clockwise.resizeProportionally
- if set to true
you will have your image size changed according to rotated rectangle (corner points) projections in other case that leaves dimensions untouched and only internal image contents are rotated.backgroundColor
- Color of the background.public void normalizeAngle(boolean resizeProportionally, Color backgroundColor)
Normalizes the angle.
This method is applicable to scanned text documents to get rid of the skewed scan.
This method uses RasterImage.getSkewAngle()
and RasterImage.rotate(float,boolean,Color)
methods.
normalizeAngle
in class RasterImage
resizeProportionally
- if set to true
you will have your image size changed according to rotated rectangle (corner points) projections in other case that leaves dimensions untouched and only internal image contents are rotated.backgroundColor
- Color of the background.public final void cacheData()
Caches the data and ensures no additional data loading will be performed from the underlying DataStreamSupporter.DataStreamContainer
.
cacheData
in class DataStreamSupporter
The following example shows how to cache all pages of a DJVU image.
String dir = "c:\\temp\\"; // Load an image from a DJVU file. com.aspose.imaging.fileformats.djvu.DjvuImage image = (com.aspose.imaging.fileformats.djvu.DjvuImage) com.aspose.imaging.Image.load(dir + "sample.djvu"); try { // This call caches all the pages so that no additional data loading will be performed from the underlying data stream. image.cacheData(); // Or you can cache the pages individually. for (com.aspose.imaging.fileformats.djvu.DjvuPage page : image.getPages()) { page.cacheData(); } } finally { image.dispose(); }
public void dither(int ditheringMethod, int bitsCount, IColorPalette customPalette)
Performs dithering on the current image.
dither
in class RasterImage
ditheringMethod
- The dithering method.bitsCount
- The final bits count for dithering.customPalette
- The custom palette for dithering.The following example loads a DJVU image and performs threshold and floyd dithering using different palette depth.
String dir = "c:\\temp\\"; com.aspose.imaging.Image image = com.aspose.imaging.Image.load(dir + "sample.djvu"); try { com.aspose.imaging.fileformats.djvu.DjvuImage dicomImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image; // Perform threshold dithering using 4-bit color palette which contains 16 colors. // The more bits specified the higher quality and the bigger size of the output image. // Note that only 1-bit, 4-bit and 8-bit palettes are supported at the moment. dicomImage.dither(com.aspose.imaging.DitheringMethod.ThresholdDithering, 4, null); dicomImage.save(dir + "sample.ThresholdDithering4.png", new com.aspose.imaging.imageoptions.PngOptions()); } finally { image.dispose(); } image = com.aspose.imaging.Image.load(dir + "sample.djvu"); try { com.aspose.imaging.fileformats.djvu.DjvuImage dicomImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image; // Perform floyd dithering using 1-bit color palette which contains only 2 colors - black and white. // The more bits specified the higher quality and the bigger size of the output image. // Note that only 1-bit, 4-bit and 8-bit palettes are supported at the moment. dicomImage.dither(com.aspose.imaging.DitheringMethod.FloydSteinbergDithering, 1, null); dicomImage.save(dir + "sample.FloydSteinbergDithering1.png", new com.aspose.imaging.imageoptions.PngOptions()); } finally { image.dispose(); }
public void filter(Rectangle rectangle, FilterOptionsBase options)
Filters the specified rectangle.
filter
in class RasterImage
rectangle
- The rectangle.options
- The options.The following example applies various types of filters to a DJVU image.
String dir = "c:\\temp\\"; com.aspose.imaging.Image image = com.aspose.imaging.Image.load(dir + "sample.djvu"); try { com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image; // Apply a median filter with a rectangle size of 5 to the entire image. djvuImage.filter(djvuImage.getBounds(), new com.aspose.imaging.imagefilters.filteroptions.MedianFilterOptions(5)); djvuImage.save(dir + "sample.MedianFilter.png", new com.aspose.imaging.imageoptions.PngOptions()); } finally { image.dispose(); } image = com.aspose.imaging.Image.load(dir + "sample.djvu"); try { com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image; // Apply a bilateral smoothing filter with a kernel size of 5 to the entire image. djvuImage.filter(djvuImage.getBounds(), new com.aspose.imaging.imagefilters.filteroptions.BilateralSmoothingFilterOptions(5)); djvuImage.save(dir + "sample.BilateralSmoothingFilter.png", new com.aspose.imaging.imageoptions.PngOptions()); } finally { image.dispose(); } image = com.aspose.imaging.Image.load(dir + "sample.djvu"); try { com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image; // Apply a Gaussian blur filter with a radius of 5 and a sigma value of 4.0 to the entire image. djvuImage.filter(djvuImage.getBounds(), new com.aspose.imaging.imagefilters.filteroptions.GaussianBlurFilterOptions(5, 4.0)); djvuImage.save(dir + "sample.GaussianBlurFilter.png", new com.aspose.imaging.imageoptions.PngOptions()); } finally { image.dispose(); } image = com.aspose.imaging.Image.load(dir + "sample.djvu"); try { com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image; // Apply a Gauss-Wiener filter with a radius of 5 and a smooth value of 4.0 to the entire image. djvuImage.filter(djvuImage.getBounds(), new com.aspose.imaging.imagefilters.filteroptions.GaussWienerFilterOptions(5, 4.0)); djvuImage.save(dir + "sample.GaussWienerFilter.png", new com.aspose.imaging.imageoptions.PngOptions()); } finally { image.dispose(); } image = com.aspose.imaging.Image.load(dir + "sample.djvu"); try { com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image; // Apply a motion wiener filter with a length of 5, a smooth value of 4.0 and an angle of 90.0 degrees to the entire image. djvuImage.filter(djvuImage.getBounds(), new com.aspose.imaging.imagefilters.filteroptions.MotionWienerFilterOptions(10, 1.0, 90.0)); djvuImage.save(dir + "sample.MotionWienerFilter.png", new com.aspose.imaging.imageoptions.PngOptions()); } finally { image.dispose(); } image = com.aspose.imaging.Image.load(dir + "sample.djvu"); try { com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image; // Apply a sharpen filter with a kernel size of 5 and a sigma value of 4.0 to the entire image. djvuImage.filter(djvuImage.getBounds(), new com.aspose.imaging.imagefilters.filteroptions.SharpenFilterOptions(5, 4.0)); djvuImage.save(dir + "sample.SharpenFilter.png", new com.aspose.imaging.imageoptions.PngOptions()); } finally { image.dispose(); }
public void replaceColor(int oldColorArgb, byte oldColorDiff, int newColorArgb)
Replaces one color to another with allowed difference and preserves original alpha value to save smooth edges.
replaceColor
in class RasterImage
oldColorArgb
- Old color ARGB value to be replaced.oldColorDiff
- Allowed difference in old color to be able to widen replaced color tone.newColorArgb
- New color ARGB value to replace old color with.public void replaceNonTransparentColors(int newColorArgb)
Replaces all non-transparent colors with new color and preserves original alpha value to save smooth edges. Note: if you use it on images without transparency, all colors will be replaced with a single one.
replaceNonTransparentColors
in class RasterImage
newColorArgb
- New color ARGB value to replace non transparent colors with.Copyright (c) 2008-2019 Aspose Pty Ltd. All Rights Reserved.