/// <summary>
/// Apply a color matrix by copying from the source to the destination
/// </summary>
/// <param name="source">Image to copy from</param>
/// <param name="sourceRect">NativeRect to copy from</param>
/// <param name="destRect">NativeRect to copy to</param>
/// <param name="dest">Image to copy to</param>
/// <param name="colorMatrix">ColorMatrix to apply</param>
public static void ApplyColorMatrix(this Bitmap source, NativeRect sourceRect, Bitmap dest, NativeRect destRect, ColorMatrix colorMatrix)
{
using (var imageAttributes = new ImageAttributes())
{
imageAttributes.ClearColorMatrix();
imageAttributes.SetColorMatrix(colorMatrix);
source.ApplyImageAttributes(sourceRect, dest, destRect, imageAttributes);
}
}
/// <summary>
/// Adjust the brightness, contract or gamma of an image.
/// Use the value "1.0f" for no changes.
/// </summary>
/// <param name="sourceBitmap">Original bitmap</param>
/// <param name="brightness"></param>
/// <param name="contrast"></param>
/// <param name="gamma"></param>
/// <returns>Bitmap with grayscale</returns>
public static Bitmap Adjust(Bitmap sourceBitmap, float brightness, float contrast, float gamma)
{
//create a blank bitmap the same size as original
// If using 8bpp than the following exception comes: A Graphics object cannot be created from an image that has an indexed pixel format.
var newBitmap = BitmapFactory.CreateEmpty(sourceBitmap.Width, sourceBitmap.Height, PixelFormat.Format24bppRgb, Color.Empty, sourceBitmap.HorizontalResolution,
sourceBitmap.VerticalResolution);
using (var adjustAttributes = CreateAdjustAttributes(brightness, contrast, gamma))
{
sourceBitmap.ApplyImageAttributes(NativeRect.Empty, newBitmap, NativeRect.Empty, adjustAttributes);
}
return(newBitmap);
}
/// <summary>
/// Apply image attributes to the image
/// </summary>
/// <param name="source">Image to apply matrix to</param>
/// <param name="imageAttributes">ImageAttributes to apply</param>
public static void ApplyColorMatrix(this Bitmap source, ImageAttributes imageAttributes)
{
source.ApplyImageAttributes(NativeRect.Empty, source, NativeRect.Empty, imageAttributes);
}
