BitmapCompression

Inheritance: java.lang.Object, com.aspose.ms.System.ValueType, com.aspose.ms.System.Enum

public final class BitmapCompression extends System.Enum

Specifies different bitmap compression methods.

Fields

Field	Description
Rgb	No compression.
Rle8	RLE 8-bit/pixel compression.
Rle4	RLE 4-bit/pixel compression.
Bitfields	RGB bit fields.
Jpeg	JPEG compression.
Png	PNG compression.
AlphaBitfields	RGBA bit fields.
Dxt1	DXT1 compression.

Example: The example shows how to export a BmpImage from a Png file while keeping the alpha channel, save a Bmp file with transparency.

String sourcePath = "input.png";
String outputPathPng = "output.png";
String outputPathBmp = "output.bmp";
// Load a PNG image from a file.
try (Image pngImage = Image.load(sourcePath))
{
    // BMP image is saved with transparency support by default.
    // If you want to explicitly specify such mode, the BmpOptions's Compression property should be set to BitmapCompression.Bitfields.
    // The BitmapCompression.Bitfields compression method is the default compression method in the BmpOptions.
    // So the same result of exporting a Bmp image with transparency can be achieved by either one of the following ways.
    // With an implicit default options:
    pngImage.save(outputPathPng);
    // With an explicit default options:
    pngImage.save(outputPathBmp, new BmpOptions());
    // Specifying the BitmapCompression.Bitfields compression method:
    pngImage.save(outputPathBmp, new BmpOptions() {{ setCompression(BitmapCompression.Bitfields); }});
}

Example: The example shows how to export a BmpImage with the Rgb compression type.

String sourcePath = "input.png";
String outputPath = "output.bmp";
// Load a PNG image from a file.
try (Image pngImage = Image.load(sourcePath))
{
    // BMP image is saved with transparency support by default, that is achieved by using the BitmapCompression.Bitfields compression method.
    // To save a BMP image with the Rgb compression method, the BmpOptions with the Compression property set to BitmapCompression.Rgb should be specified.
    pngImage.save(outputPath, new BmpOptions()
    {{
        setCompression(BitmapCompression.Rgb);
    }});
}

Rgb

public static final long Rgb

No compression.

Rle8

public static final long Rle8

RLE 8-bit/pixel compression. Can be used only with 8-bit/pixel bitmaps.

Rle4

public static final long Rle4

RLE 4-bit/pixel compression. Can be used only with 4-bit/pixel bitmaps.

Bitfields

public static final long Bitfields

RGB bit fields. Can be used only with 16 and 32-bit/pixel bitmaps.

Jpeg

public static final long Jpeg

JPEG compression. The bitmap contains a JPEG image.

Png

public static final long Png

PNG compression. The bitmap contains a PNG image.

AlphaBitfields

public static final long AlphaBitfields

RGBA bit fields. Can be used only with 16 and 32-bit/pixel bitmaps.

Dxt1

public static final long Dxt1

DXT1 compression. The bitmap contains a texture.