public Bitmap TransformImage(Image source, Image destination)
{
unsafe
{
var bitMap = new Bitmap(source);
BitmapData bitmapData = bitMap.LockBits(new Rectangle(0, 0, bitMap.Width, bitMap.Height), ImageLockMode.ReadWrite, bitMap.PixelFormat);
int bytesPerPixel = System.Drawing.Bitmap.GetPixelFormatSize(bitMap.PixelFormat) / 8;
int heightInPixels = bitmapData.Height;
int widthInBytes = bitmapData.Width * bytesPerPixel;
byte * PtrFirstPixel = (byte *)bitmapData.Scan0;
Parallel.For(0, heightInPixels, y =>
{
byte *currentLine = PtrFirstPixel + (y * bitmapData.Stride);
for (int x = 0; x < widthInBytes; x = x + bytesPerPixel)
{
var newPixel = PixelOperations.GreyScale(Color.FromArgb(currentLine[x],
currentLine[x + 1], currentLine[x + 2]));
currentLine[x] = newPixel.R;
currentLine[x + 1] = newPixel.G;
currentLine[x + 2] = newPixel.B;
}
});
bitMap.UnlockBits(bitmapData);
return(bitMap);
}
}