/// <summary>
/// Process the filter on the specified image.
/// </summary>
/// <param name="sourceData">Source image data.</param>
/// <param name="destinationData">Destination image data.</param>
protected override unsafe void ProcessFilter(UnmanagedImage sourceData, UnmanagedImage destinationData)
{
var pixelSize = Image.GetPixelFormatSize(sourceData.PixelFormat) / 8;
// get width and height
var width = sourceData.Width;
var height = sourceData.Height;
var srcOffset = sourceData.Stride - width * pixelSize;
var dstOffset = destinationData.Stride - width;
// do the job
var src = (byte *)sourceData.ImageData.ToPointer();
var dst = (byte *)destinationData.ImageData.ToPointer();
// for each row
for (var y = 0; y < height; y++)
{
// for each pixel
for (var x = 0; x < width; x++, src += pixelSize, dst++)
{
var r = (float)src[RGB.R] / 255;
var g = (float)src[RGB.G] / 255;
var b = (float)src[RGB.B] / 255;
var yindex = (float)(0.2989 * r + 0.5866 * g + 0.1145 * b);
*dst = (byte)(yindex * 255);
}
src += srcOffset;
dst += dstOffset;
}
}
public int GetPixelFormatBitsPerPixel()
{
return(Image.GetPixelFormatSize(fSystemImage.PixelFormat));
}