LitDev.Engines.FIP.SubtractImages C# (CSharp) Method

        public Bitmap SubtractImages(Bitmap Left, Bitmap Right)
        {
            if (Left.Width != Right.Width)
            {
                throw new Exception("Images dimension must be equal.");
            }

            if (Left.Height != Right.Height)
            {
                throw new Exception("Images dimension must be equal.");
            }

            Bitmap OutputImage = new System.Drawing.Bitmap(Left.Width, Left.Height);

            //int x, y;

            for (int x = 0; x < Left.Width; x++)
            {
                for (int y = 0; y < Left.Height; y++)
                {
                    Color pixelLeft = Left.GetPixel(x, y);
                    Color pixelRight = Right.GetPixel(x, y);
                    int gs1 = (int)((pixelLeft.R * 0.3) + (pixelLeft.G * 0.59) + (pixelLeft.B * 0.11));
                    int gs2 = (int)((pixelRight.R * 0.3) + (pixelRight.G * 0.59) + (pixelRight.B * 0.11));

                    int gs = gs1 - gs2;

                    if (gs > 255) gs = 255;
                    if (gs < 0) gs = 0;

                    Color newColor = Color.FromArgb(255, gs, gs, gs);
                    OutputImage.SetPixel(x, y, newColor);
                }
            }

            return OutputImage;
        }