[函数名称]

RGB分量调整         RGBAdjustProcess(WriteableBitmap src, int value,int threshould)

[算法说明]

  RGB分量调整实际上是分别对每个像素的RGB三个分量进行调整，公式如下：

[函数代码]

        /// <summary>
        /// R,G,B value adjusting.
        /// </summary>
        /// <param name="src">The source image.</param>
        /// <param name="value">To judge which one to adjust, R is 3, G is 2, B is 1.</param>
        /// <param name="threshould">It is a value to adjust the result image.</param>
        /// <returns></returns>
        public static WriteableBitmap RGBAdjustProcess(WriteableBitmap src, int value,int threshould)////41 RGB分量调整 
        {
            if (src != null)
            {
                int w = src.PixelWidth;
                int h = src.PixelHeight;
                WriteableBitmap srcImage = new WriteableBitmap(w, h);
                byte[] temp = src.PixelBuffer.ToArray();
                if (value == 1)
                {
                    for (int i = 0; i < temp.Length; i += 4)
                    {
                        temp[i] = (byte)(Math.Max(0, Math.Min((temp[i] + threshould), 255)));
                    }
                }
                if (value == 2)
                {
                    for (int i = 0; i < temp.Length; i += 4)
                    {
                        temp[i + 1] = (byte)(Math.Max(0, Math.Min((temp[i + 1] + threshould), 255)));
                    }
                }
                if (value == 3)
                {
                    for (int i = 0; i < temp.Length; i += 4)
                    {
                        temp[i + 2] = (byte)(Math.Max(0, Math.Min((temp[i + 2] + threshould), 255)));
                    }
                }
                Stream sTemp = srcImage.PixelBuffer.AsStream();
                sTemp.Seek(0, SeekOrigin.Begin);
                sTemp.Write(temp, 0, w * 4 * h);
                return srcImage;
            }
            else
            {
                return null;
            }
        }