C#实现图像反色的方法

本文实例讲述了c#实现图像反色的方法。分享给大家供大家参考。具体如下：

//定义图像反色函数
private static bitmap pcontray (bitmap a)
{
 int w = a.width;
 int h = a.height;
 bitmap dstbitmap = new bitmap(a.width, a.height, system.drawing.imaging.pixelformat.format24bpprgb);
 system.drawing.imaging.bitmapdata srcdata = a.lockbits(new rectangle(0, 0, w, h), system.drawing.imaging.imagelockmode.readonly, system.drawing.imaging.pixelformat.format24bpprgb);
 system.drawing.imaging.bitmapdata dstdata = dstbitmap.lockbits(new rectangle(0, 0, w, h), system.drawing.imaging.imagelockmode.writeonly, system.drawing.imaging.pixelformat.format24bpprgb);
 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;
   r = p[2];
   g = p[1];
   b = p[0];
   pout[2] = (byte)(255 - r);
   pout[1] = (byte)(255 - g);
   pout[0] = (byte)(255 - b);
   pin += 3;
   pout += 3;
   }
   pin += srcdata.stride - w * 3;
   pout += srcdata.stride - w * 3;
  }
  a.unlockbits(srcdata);
  dstbitmap.unlockbits(dstdata);
  return dstbitmap;
 }
}

希望本文所述对大家的c#程序设计有所帮助。