Enum BitmapCompression
Namespace: Aspose.Imaging.FileFormats.Bmp
Assembly: Aspose.Imaging.dll (25.7.0)
Specifies different bitmap compression methods.
public enum BitmapCompression : uintFields
AlphaBitfields = 6
RGBA bit fields. Can be used only with 16 and 32-bit/pixel bitmaps.
Bitfields = 3
RGB bit fields. Can be used only with 16 and 32-bit/pixel bitmaps.
Dxt1 = 827611204
DXT1 compression. The bitmap contains a texture.
Jpeg = 4
JPEG compression. The bitmap contains a JPEG image.
Png = 5
PNG compression. The bitmap contains a PNG image.
Rgb = 0
No compression.
Rle4 = 2
RLE 4-bit/pixel compression. Can be used only with 4-bit/pixel bitmaps.
Rle8 = 1
RLE 8-bit/pixel compression. Can be used only with 8-bit/pixel bitmaps.
Examples
The example shows how to export a BmpImage with the Rgb compression type.
string sourcePath = "input.png";
// Load a PNG image from a file.
using (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() { Compression = BitmapCompression.Rgb });
}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";
// Load a PNG image from a file.
using (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(outputPath);
// With an explicit default options:
pngImage.Save(outputPath, new BmpOptions());
// Specifying the BitmapCompression.Bitfields compression method:
pngImage.Save(outputPath, new BmpOptions() { Compression = BitmapCompression.Bitfields });
}
