C#图像伪彩色处理方法

本文实例讲述了c#图像伪彩色处理方法。分享给大家供大家参考。具体如下：

//灰度图转伪彩色图像函数
public bitmap pgraytocolor(bitmap src)
{
  try
  {
   bitmap a = new bitmap(src);
   rectangle rect = new rectangle(0, 0, a.width, a.height);
   system.drawing.imaging.bitmapdata bmpdata = a.lockbits(rect, system.drawing.imaging.imagelockmode.readwrite, system.drawing.imaging.pixelformat.format24bpprgb);
   int stride = bmpdata.stride;
   unsafe
   {
     byte* pin = (byte*)bmpdata.scan0.topointer();
     byte* p;
     int r, g, b;
     int temp = 0;
     for (int y = 0; y < a.height; y++)
     {
     for (int x = 0; x < a.width; x++)
     {
       p = pin;
       b = p[0];
       g = p[1];
       r = p[2];
       temp = (byte)(b * 0.114 + g * 0.587 + r * 0.299);
       if (temp >= 0 && temp <= 63)
       {
        p[2] = 0;
        p[1] = (byte)(254 - 4 * temp);
        p[0] = (byte)255;
       }
       if (temp >= 64 && temp <= 127)
       {
        p[2] = 0;
        p[1] = (byte)(4 * temp - 254);
        p[0] = (byte)(510 - 4 * temp);
       }
       if (temp >= 128 && temp <= 191)
       {
        p[2] = (byte)(4 * temp - 510);
        p[1] = (byte)(255);
        p[0] = (byte)0;
       }
       if (temp >= 192 && temp <= 255)
       {
        p[2] = (byte)255;
        p[1] = (byte)(1022 - 4 * temp);
        p[0] = (byte)0;
       }
       pin += 3;
     }
     pin += stride - a.width * 3;
     }
   }
   a.unlockbits(bmpdata);
   return a;
  }
  catch (exception e)
  {
   messagebox.show(e.message.tostring());
   return null;
  }
}

原图：

效果图：

反色图：

希望本文所述对大家的c#程序设计有所帮助。