Win8Metro(C#)数字图像处理--2.5图像亮度调整

原文:Win8Metro(C#)数字图像处理--2.5图像亮度调整



2.5图像亮度调整函数

[函数名称]

图像亮度调整函数BrightnessAdjustProcess(WriteableBitmap
src, intbrightnessValue)

[函数代码]

///<summary>

///
Bright adjust process.

///</summary>

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

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

///<returns></returns>

publicstaticWriteableBitmap
BrightnessAdjustProcess(WriteableBitmap src,
int brightnessValue)////5亮度调整

{

if(src!=null
)

{

int
w = src.PixelWidth;

int
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;

}

}