Win8Metro(C#)數字圖像處理--2.5圖像亮度調整



[函數名稱]

  圖像亮度調整函數BrightnessAdjustProcess(WriteableBitmap

src, intbrightnessValue)

[函數代碼]

       ///<summary>

       ///

Bright adjust process.

       ///</summary>

       ///<param

name="src">Source image.</param>

name="brightnessValue">Brightness value, from -255 to 255.</param>

       ///<returns></returns>

       publicstaticWriteableBitmap

BrightnessAdjustProcess(WriteableBitmap src,

int brightnessValue)////5亮度調整

       {

           if(src!=null

)

           {

           int

w = src.PixelWidth;

h = src.PixelHeight;

           WriteableBitmap

brightImage =newWriteableBitmap(w,h);

           byte[]

temp = src.PixelBuffer.ToArray();

           for

(int i = 0; i < temp.Length; i += 4)

               temp[i] = (byte)(((brightnessValue

+ temp[i]) > 255 ? 255 : (brightnessValue + temp[i])) < 0 ? 0 : ((brightnessValue + temp[i]) > 255 ? 255 : (brightnessValue + temp[i])));

               temp[i+1] = (byte)(((brightnessValue

+ temp[i+1]) > 255 ? 255 : (brightnessValue + temp[i+1])) < 0 ? 0 : ((brightnessValue + temp[i+1]) > 255 ? 255 : (brightnessValue + temp[i+1])));

               temp[i+2] = (byte)(((brightnessValue

+ temp[i+2]) > 255 ? 255 : (brightnessValue + temp[i+2])) < 0 ? 0 : ((brightnessValue + temp[i+2]) > 255 ? 255 : (brightnessValue + temp[i+2])));

           }

           Stream

sTemp = brightImage.PixelBuffer.AsStream();

           sTemp.Seek(0,

SeekOrigin.Begin);

           sTemp.Write(temp, 0, w * 4 * h);

           return

brightImage;

           else

               returnnull;

           }  

       }