private int NearestColor(Color Pixel)
        {
            int diffR; int diffB; int diffG;
            int smallestDiffValue = 0x7FFFFFFF;
            int SmallestDiff = 0x00;
            int diff = 0x00;

            for (int C = 0; C < 256; C++)
            {
                diffR = Pixel.R - Palette[C].R;
                diffB = Pixel.B - Palette[C].B;
                diffG = Pixel.G - Palette[C].G;
                diff = diffR*diffR + diffB*diffB + diffG*diffG;
                if (diff == 0) { return C; }         // Quit early if match found
                if (diff < smallestDiffValue)        // Otherwise compare to smallest color found
                { SmallestDiff = C; smallestDiffValue = diff; }
            }
            return SmallestDiff;
        }