HOWTO: Highlight similar pixels in 2 bitmaps

//load the 2 images
RasterImage bitmap1 = _codecs.Load("Image1.png");
RasterImage bitmap2 = _codecs.Load("Image2.png");
//pefrom XOR combining to convert similar pixels to black in image2. All non-similar pixels become non-black
LeadRect combineRect = new LeadRect(0, 0, bitmap1.Width, bitmap1.Height);
CombineFastCommand combineCmd = new CombineFastCommand(bitmap2, combineRect, new LeadPoint(0, 0), CombineFastCommandFlags.OperationXor);
combineCmd.Run(bitmap1);
//create a region in image2 with all the black pixels. Those pixels were the similar ones.
bitmap2.AddColorToRegion(RasterColor.Black, RasterRegionCombineMode.Set);
//fill the region with green
FillCommand fillGreen = new FillCommand(RasterColor.FromKnownColor(RasterKnownColor.Green));
fillGreen.Run(bitmap2);
//perfom copy combining to copy the green pixels to the first image
combineCmd.DestinationImage = bitmap1;
combineCmd.Flags = CombineFastCommandFlags.SourceCopy;
combineCmd.Run(bitmap2);
//Save the result
_codecs.Save(bitmap1, "Result.png", RasterImageFormat.Png, 24);