ARKBreedingStats.ArkOCR.GetGreyScale C# (CSharp) Метод

        public Bitmap GetGreyScale(Bitmap source, bool writingInWhite = false)
        {
            Bitmap dest = (Bitmap)source.Clone();

            PixelFormat pxf = PixelFormat.Format24bppRgb;

            Rectangle rect = new Rectangle(0, 0, dest.Width, dest.Height);
            BitmapData bmpData = dest.LockBits(rect, ImageLockMode.ReadWrite, pxf);

            IntPtr ptr = bmpData.Scan0;

            // Declare an array to hold the bytes of the bitmap.
            int numBytes = bmpData.Stride * dest.Height;
            byte[] rgbValues = new byte[numBytes];

            // Copy the RGB values into the array.
            Marshal.Copy(ptr, rgbValues, 0, numBytes);

            int extraBytes = bmpData.Stride % 3;
            // convert to greyscale
            for (int i = 0; i < rect.Width; i++)
            {
                for (int j = 0; j < rect.Height; j++)
                {
                    int idx = j * bmpData.Stride + i * 3;
                    byte grey;

                    if (writingInWhite)
                    {
                        int sum = rgbValues[idx] + rgbValues[idx + 1] + rgbValues[idx + 2];

                        grey = Math.Max(Math.Max(rgbValues[idx], rgbValues[idx + 1]), rgbValues[idx + 2]);
                    }
                    else
                    {
                        int sum = rgbValues[idx] + rgbValues[idx + 1] + rgbValues[idx + 2];

                        grey = (byte)(sum / 3);
                    }

                    rgbValues[idx] = grey;
                    rgbValues[idx + 1] = grey;
                    rgbValues[idx + 2] = grey;

                }
            }

            // Copy the RGB values back to the bitmap
            Marshal.Copy(rgbValues, 0, ptr, numBytes);

            dest.UnlockBits(bmpData);

            return dest;
        }