C#图像透明度调整的方法

本文实例讲述了C#图像透明度调整的方法。分享给大家供大家参考。具体如下:

//定义图像透明度调整函数

public Bitmap PTransparentAdjust(Bitmap src,int num)

{

try

{

int w = src.Width;

int h = src.Height;

Bitmap dstBitmap = new Bitmap(src.Width, src.Height, System.Drawing.Imaging.PixelFormat.Format32bppArgb);

System.Drawing.Imaging.BitmapData srcData = src.LockBits(new Rectangle(0, 0, w, h), System.Drawing.Imaging.ImageLockMode.ReadOnly, System.Drawing.Imaging.PixelFormat.Format32bppArgb);

System.Drawing.Imaging.BitmapData dstData = dstBitmap.LockBits(new Rectangle(0, 0, w, h), System.Drawing.Imaging.ImageLockMode.WriteOnly, System.Drawing.Imaging.PixelFormat.Format32bppArgb);

unsafe

{

byte* pIn = (byte*)srcData.Scan0.ToPointer();

byte* pOut = (byte*)dstData.Scan0.ToPointer();

byte* p;

int stride = srcData.Stride;

int r, g, b;

for (int y = 0; y < h; y++)

{

for (int x = 0; x < w; x++)

{

p = pIn;

b = pIn[0];

g = pIn[1];

r = pIn[2];

pOut[1] = (byte)g;

pOut[2] = (byte)r;

pOut[3] = (byte)num;

pOut[0] = (byte)b;

pIn += 4;

pOut += 4;

}

pIn += srcData.Stride - w * 4;

pOut += srcData.Stride - w * 4;

}

src.UnlockBits(srcData);

dstBitmap.UnlockBits(dstData);

return dstBitmap;

}

}

catch (Exception e)

{

MessageBox.Show(e.Message.ToString());

return null;

}

}

原图:

效果图(50%):

希望本文所述对大家的C#程序设计有所帮助。

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