DjvuImage

Inheritance: java.lang.Object, com.aspose.imaging.DisposableObject, com.aspose.imaging.DataStreamSupporter, com.aspose.imaging.Image, com.aspose.imaging.RasterImage, com.aspose.imaging.RasterCachedImage, com.aspose.imaging.RasterCachedMultipageImage

public final class DjvuImage extends RasterCachedMultipageImage

DjvuDocument class

Constructors

Constructor Description
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(System.IO.Stream stream, LoadOptions loadOptions) Initializes a new instance of the DjvuImage class.

Fields

Field Description
PropertyChanged Occurs when a property value changes.

Methods

Method Description
getIdentifier() Gets the unique identifier for the document
getPageCount() Gets the page count.
getPages() Gets the pages.
getDjvuPages() Gets the pages for the document
getActivePage() Gets or sets the currently active page
setActivePage(DjvuPage value) Gets or sets the currently active page
getFirstPage() Gets the first page of the document
getLastPage() Gets the last page of the document
getNextPage() Gets the next page of the document
getPreviousPage() Gets the previous page of the document
getFileFormat() Gets a value of file format
hasAlpha() Gets the Has alpha channel.
loadDocument(InputStream stream) Loads the document.
loadDocument(InputStream stream, LoadOptions loadOptions) Loads the document.
rotate(float angle, boolean resizeProportionally, Color backgroundColor) !:RasterCahcedMultipageImage.Rotate image around the center.
resize(int newWidth, int newHeight, int resizeType) Resizes the image.
resizeWidthProportionally(int newWidth, int resizeType) Resizes the width proportionally.
resizeHeightProportionally(int newHeight, int resizeType) Resizes the width proportionally.
rotateFlip(int rotateFlipType) Rotates, flips, or rotates and flips the Active frame only.
dither(int ditheringMethod, int bitsCount, IColorPalette customPalette) Performs dithering on the current image.
crop(Rectangle rectangle) Cropping the image.
crop(int leftShift, int rightShift, int topShift, int bottomShift) Crop image with shifts.
binarizeFixed(byte threshold) Binarization of an image with predefined threshold
binarizeOtsu() Binarization of an image with Otsu thresholding
binarizeBradley(double brightnessDifference, int windowSize) Binarization of an image using Bradley’s adaptive thresholding algorithm using the integral image thresholding
grayscale() Transformation of an image to its grayscale representation
adjustGamma(float gamma) Gamma-correction of an image.
adjustGamma(float gammaRed, float gammaGreen, float gammaBlue) Gamma-correction of an image.
adjustBrightness(int brightness) Adjust of a brightness for image.
adjustContrast(float contrast) Image contrasting
filter(Rectangle rectangle, FilterOptionsBase options) Filters the specified rectangle.
resize(int newWidth, int newHeight, ImageResizeSettings settings) Resizes the image.
cacheData() Caches the data private.

Example: 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();
}

DjvuImage(InputStream stream)

public DjvuImage(InputStream stream)

Initializes a new instance of the DjvuImage class.

Parameters:

Parameter Type Description
stream java.io.InputStream The stream.

DjvuImage(InputStream stream, LoadOptions loadOptions)

public DjvuImage(InputStream stream, LoadOptions loadOptions)

Initializes a new instance of the DjvuImage class.

Parameters:

Parameter Type Description
stream java.io.InputStream The stream to load from.
loadOptions LoadOptions The load options.

DjvuImage(System.IO.Stream stream, LoadOptions loadOptions)

public DjvuImage(System.IO.Stream stream, LoadOptions loadOptions)

Initializes a new instance of the DjvuImage class.

Parameters:

Parameter Type Description
stream com.aspose.ms.System.IO.Stream The stream.
loadOptions LoadOptions The load options.

PropertyChanged

public final StdEvent<System.ComponentModel.PropertyChangedEventArgs> PropertyChanged

Occurs when a property value changes.

getIdentifier()

public int getIdentifier()

Gets the unique identifier for the document

Returns: int - The identifier.

getPageCount()

public int getPageCount()

Gets the page count.

Value: The page count.

Returns: int - the page count.

getPages()

public Image[] getPages()

Gets the pages.

Value: The pages.

Returns: com.aspose.imaging.Image[] - the pages.

Example: 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();
}

getDjvuPages()

public DjvuPage[] getDjvuPages()

Gets the pages for the document

Value: The pages.

Returns: com.aspose.imaging.fileformats.djvu.DjvuPage[] - the pages for the document

getActivePage()

public DjvuPage getActivePage()

Gets or sets the currently active page

Returns: DjvuPage - The active page.

Example: 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

setActivePage(DjvuPage value)

public void setActivePage(DjvuPage value)

Gets or sets the currently active page

Parameters:

Parameter Type Description
value DjvuPage The active page.

getFirstPage()

public DjvuPage getFirstPage()

Gets the first page of the document

Returns: DjvuPage - The first page.

Example: 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

getLastPage()

public DjvuPage getLastPage()

Gets the last page of the document

Returns: DjvuPage - The last page.

Example: 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

getNextPage()

public DjvuPage getNextPage()

Gets the next page of the document

Returns: DjvuPage - The next page.

getPreviousPage()

public DjvuPage getPreviousPage()

Gets the previous page of the document

Returns: DjvuPage - The previous page.

getFileFormat()

public long getFileFormat()

Gets a value of file format

Returns: long

hasAlpha()

public boolean hasAlpha()

Gets the Has alpha channel.

Value: The Has alpha channel.

Returns: boolean - the Has alpha channel.

loadDocument(InputStream stream)

public static DjvuImage loadDocument(InputStream stream)

Loads the document.

Parameters:

Parameter Type Description
stream java.io.InputStream The stream.

Returns: DjvuImage - Loaded djvu document

loadDocument(InputStream stream, LoadOptions loadOptions)

public static DjvuImage loadDocument(InputStream stream, LoadOptions loadOptions)

Loads the document.

Parameters:

Parameter Type Description
stream java.io.InputStream The stream.
loadOptions LoadOptions The load options.

Returns: DjvuImage - Loaded djvu document

rotate(float angle, boolean resizeProportionally, Color backgroundColor)

public void rotate(float angle, boolean resizeProportionally, Color backgroundColor)

!:RasterCahcedMultipageImage.Rotate image around the center.

Parameters:

Parameter Type Description
angle float The rotate angle in degrees. Positive values will rotate clockwise.
resizeProportionally boolean 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 `` image contents are rotated.
backgroundColor Color Color of the background.

resize(int newWidth, int newHeight, int resizeType)

public void resize(int newWidth, int newHeight, int resizeType)

Resizes the image.

Parameters:

Parameter Type Description
newWidth int The new width.
newHeight int The new height.
resizeType int The resize type.

Example: 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();
}

resizeWidthProportionally(int newWidth, int resizeType)

public void resizeWidthProportionally(int newWidth, int resizeType)

Resizes the width proportionally.

Parameters:

Parameter Type Description
newWidth int The new width.
resizeType int Type of the resize.

Example: This example loads a DJVU image and resizes it proportionally using various resizing methods. 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();
}

resizeHeightProportionally(int newHeight, int resizeType)

public void resizeHeightProportionally(int newHeight, int resizeType)

Resizes the width proportionally.

Parameters:

Parameter Type Description
newHeight int The new height.
resizeType int Type of the resize.

Example: This example loads a DJVU image and resizes it proportionally using various resizing methods. 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();
}

rotateFlip(int rotateFlipType)

public void rotateFlip(int rotateFlipType)

Rotates, flips, or rotates and flips the Active frame only.

Parameters:

Parameter Type Description
rotateFlipType int The rotate flip type.

Example: 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();
    }
}

dither(int ditheringMethod, int bitsCount, IColorPalette customPalette)

public void dither(int ditheringMethod, int bitsCount, IColorPalette customPalette)

Performs dithering on the current image.

Parameters:

Parameter Type Description
ditheringMethod int The dithering method.
bitsCount int The final bits count for dithering.
customPalette IColorPalette The custom palette for dithering.

Example: 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();
}

crop(Rectangle rectangle)

public void crop(Rectangle rectangle)

Cropping the image.

Parameters:

Parameter Type Description
rectangle Rectangle The rectangle.

Example: The following example crops a DJVU image. 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();
}

crop(int leftShift, int rightShift, int topShift, int bottomShift)

public void crop(int leftShift, int rightShift, int topShift, int bottomShift)

Crop image with shifts.

Parameters:

Parameter Type Description
leftShift int The left shift.
rightShift int The right shift.
topShift int The top shift.
bottomShift int The bottom shift.

binarizeFixed(byte threshold)

public void binarizeFixed(byte threshold)

Binarization of an image with predefined threshold

Parameters:

Parameter Type Description
threshold byte Threshold value. If corresponding gray value of a pixel is greater than threshold, a value of 255 will be assigned to it, 0 otherwise.

Example: The following example binarizes a DJVU image with the predefined threshold. 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();
}

binarizeOtsu()

public void binarizeOtsu()

Binarization of an image with Otsu thresholding

Example: The following example binarizes a DJVU image with Otsu thresholding. 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();
}

binarizeBradley(double brightnessDifference, int windowSize)

public void binarizeBradley(double brightnessDifference, int windowSize)

Binarization of an image using Bradley’s adaptive thresholding algorithm using the integral image thresholding

Parameters:

Parameter Type Description
brightnessDifference double The brightness difference between pixel and the average of an s x s window of pixels centered around this pixel.
windowSize int The size of s x s window of pixels centered around this pixel

Example: The following example binarizes a DJVU image with Bradley’s adaptive thresholding algorithm with the specified window size. The 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();
}

grayscale()

public void grayscale()

Transformation of an image to its grayscale representation

Example: The following example transforms a colored DJVU image to its grayscale representation. 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();
}

adjustGamma(float gamma)

public void adjustGamma(float gamma)

Gamma-correction of an image.

Parameters:

Parameter Type Description
gamma float Gamma for red, green and blue channels coefficient

Example: The 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();
}

adjustGamma(float gammaRed, float gammaGreen, float gammaBlue)

public void adjustGamma(float gammaRed, float gammaGreen, float gammaBlue)

Gamma-correction of an image.

Parameters:

Parameter Type Description
gammaRed float Gamma for red channel coefficient
gammaGreen float Gamma for green channel coefficient
gammaBlue float Gamma for blue channel coefficient

Example: The 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();
}

adjustBrightness(int brightness)

public void adjustBrightness(int brightness)

Adjust of a brightness for image.

Parameters:

Parameter Type Description
brightness int Brightness value.

Example: 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();
}

adjustContrast(float contrast)

public void adjustContrast(float contrast)

Image contrasting

Parameters:

Parameter Type Description
contrast float Contrast value (in range [-100; 100])

Example: 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();
}

filter(Rectangle rectangle, FilterOptionsBase options)

public void filter(Rectangle rectangle, FilterOptionsBase options)

Filters the specified rectangle.

Parameters:

Parameter Type Description
rectangle Rectangle The rectangle.
options FilterOptionsBase The options.

Example: 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();
}

resize(int newWidth, int newHeight, ImageResizeSettings settings)

public void resize(int newWidth, int newHeight, ImageResizeSettings settings)

Resizes the image.

Parameters:

Parameter Type Description
newWidth int The new width.
newHeight int The new height.
settings ImageResizeSettings The resize settings.

Example: 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();
}

cacheData()

public void cacheData()

Caches the data private.

Example: 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();
}
DjvuPage