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using System;
namespace System.Drawing
{
internal static class ImageEx
{
// RGB to BGR convert Matrix
private static float[][] rgbtobgr = new float[][]
{
new float[] {0, 0, 1, 0, 0},
new float[] {0, 1, 0, 0, 0},
new float[] {1, 0, 0, 0, 0},
new float[] {0, 0, 0, 1, 0},
new float[] {0, 0, 0, 0, 1}
};
internal static void RGBToBGR(this Image bmp)
{
System.Drawing.Imaging.ImageAttributes ia = new System.Drawing.Imaging.ImageAttributes();
System.Drawing.Imaging.ColorMatrix cm = new System.Drawing.Imaging.ColorMatrix(rgbtobgr);
ia.SetColorMatrix(cm);
using (System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bmp))
{
g.DrawImage(bmp, new System.Drawing.Rectangle(0, 0, bmp.Width, bmp.Height), 0, 0, bmp.Width, bmp.Height, System.Drawing.GraphicsUnit.Pixel, ia);
}
}
}
}
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