RasterImage.HasAlpha

RasterImage.HasAlpha property

Gets a value indicating whether this instance has alpha.

public virtual bool HasAlpha { get; }

Property Value

true if this instance has alpha; otherwise, false.

Examples

The following example loads raster images and prints information about raw data format and alpha channel.

[C#]

// The image files to load.
string[] fileNames = new string[]
{
    @"c:\temp\sample.bmp",
    @"c:\temp\alpha.png",
};

foreach (string fileName in fileNames)
{
    using (Aspose.Imaging.Image image = Aspose.Imaging.Image.Load(fileName))
    {
        Aspose.Imaging.RasterImage rasterImage = (Aspose.Imaging.RasterImage)image;
        System.Console.WriteLine("ImageFile={0}, FileFormat={1}, HasAlpha={2}", fileName, rasterImage.RawDataFormat, rasterImage.HasAlpha);
    }
}

// The output may look like this:
// ImageFile=c:\temp\sample.bmp, FileFormat=Rgb24Bpp, used channels: 8,8,8, HasAlpha=False
// ImageFile=c:\temp\alpha.png, FileFormat=RGBA32Bpp, used channels: 8,8,8,8, HasAlpha=True

The following example shows how to extract information about raw data format and alpha channel from a BMP image.

[C#]

// Create a 32-bpp BMP image of 100 x 100 px.
using (Aspose.Imaging.FileFormats.Bmp.BmpImage bmpImage = new Aspose.Imaging.FileFormats.Bmp.BmpImage(100, 100, 32, null))
{
    System.Console.WriteLine("FileFormat={0}, RawDataFormat={1}, HasAlpha={2}", bmpImage.FileFormat, bmpImage.RawDataFormat, bmpImage.HasAlpha);
};

// Create a 24-bpp BMP image of 100 x 100 px.
using (Aspose.Imaging.FileFormats.Bmp.BmpImage bmpImage = new Aspose.Imaging.FileFormats.Bmp.BmpImage(100, 100, 24, null))
{
    System.Console.WriteLine("FileFormat={0}, RawDataFormat={1}, HasAlpha={2}", bmpImage.FileFormat, bmpImage.RawDataFormat, bmpImage.HasAlpha);
};

// Generally, BMP doesn't support alpha channel so the output will look like this:
// FileFormat = Bmp, RawDataFormat = Rgb32Bpp, used channels: 8,8,8,8, HasAlpha = False
// FileFormat = Bmp, RawDataFormat = Rgb24Bpp, used channels: 8,8,8, HasAlpha = False

See Also

RasterImage.HasTransparentColor