原文:



[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]

/// 
        /// R,G,B value adjusting.        /// 
        /// The source image.        /// To judge which one to adjust, R is 3, G is 2, B is 1.        /// It is a value to adjust the result image.        /// 
             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;            }        }