1. COLORREF pixel;  
2.    int maxY = imgOriginal.GetHeight(), maxX = imgOriginal.GetWidth();  
3.    byte r,g,b,avg;  
4.    for (int y=0; y<maxY; y++) {  
5.        for (int x=0; x<maxX; x++) {  
6.             pixel = imgOriginal.GetPixel(x,y);  
7.             r = GetRValue(pixel);  
8.             g = GetGValue(pixel);  
9.             b = GetBValue(pixel);  
10.             avg = (r+ g+ b)/3;  
11.             imgOriginal.SetPixelRGB(x,y,avg,avg,avg);  
12. }}  

1.    byte* pRealData;  
2.    pRealData=http://www.mamicode.com/(byte*)imgOriginal.GetBits();
3.    int pit=imgOriginal.GetPitch();  
4.    int bitCount=imgOriginal.GetBPP()/8;  
5.    for (int y=0; y<maxY; y++) {  
6.         for (int x=0; x<maxX; x++) {  
7.              int grayVal=(int)(int)(*(pRealData + pit*y + x*bitCount))*0.3    
8.                      + (int)(int)(*(pRealData + pit*y + x*bitCount +1))*0.59    
9.                      + (int)(int)(*(pRealData + pit*y + x*bitCount +2))*0.11;  
10.      *(pRealData + pit*y + x*bitCount)=grayVal;  
11.      *(pRealData + pit*y + x*bitCount +1)=grayVal;  
12.      *(pRealData + pit*y + x*bitCount +2)=grayVal;  
13. //如果是8位灰度图像，直接读取一个BYTE位为灰度值  
14. //如果是24位RGB图像，则依次读取pixAddr,pixAddr+1,pixAddr+2为B、G、R分量值  
15. }}  

        int i,j,temp;	int pixel[4];	int width = yuantu.GetWidth();	int height = yuantu.GetHeight();	int widthBytes = yuantu.GetPitch();	bianyuantu.Create(width,height,yuantu.GetBPP());	if(yuantu.IsIndexed())	{		yuantu.GetColorTable(0,256,colorTable);		bianyuantu.SetColorTable(0,256,colorTable);	}	BYTE *pYuantuData = http://www.mamicode.com/(BYTE*)yuantu.GetBits();>

1. void PixelsChangedToGray(CImage *pImage)  
2. {  
3.     int  nByte,j,i,nWidth,nHeight,nBytesPerPixel;  
4.     BYTE  *pPixelLine,cNewPixelValue;  
5.     nWidth=pImage->GetWidth();   nHeight=pImage->GetHeight();  
6.     nBytesPerPixel= pImage->GetBPP()/8;  
7.     for (i=0;i<nHeight;i++){  
8.         pPixelLine =(BYTE*) pImage->GetPixelAddress(0,i);  
9.         nByte=0;  
10.         for (j=0;j<nWidth;j++){      cNewPixelValue=http://www.mamicode.com/(BYTE)(0.11*pPixelLine[nByte]  
11.                                                         +0.59*pPixelLine[nByte+1]  
12.                                                         +0.30*pPixelLine[nByte+2]);  
13.         pPixelLine[nByte] = pPixelLine[nByte+1] = pPixelLine[nByte+2]  
14.                         = cNewPixelValue;  
15.         nByte+=nBytesPerPixel;  
16.         }    
17.     }  
18. }  

1. void PaletteChangedToGray(CImage *pImage)  
2. {  
3.     RGBQUAD  ColorTabs[256];  
4.     int  i,nColorTableEntries,nNewGrayColor;  
5.     nColorTableEntries=pImage->GetMaxColorTableEntries();  
6.     pImage->GetColorTable(0,nColorTableEntries,ColorTabs);  
7.     for (i=0;i<nColorTableEntries;i++){  
8.         nNewGrayColor=(int)(0.11*ColorTabs[i].rgbBlue  
9.                                            + 0.59*ColorTabs[i].rgbGreen   
10.                                            + 0.30*ColorTabs[i].rgbRed);  
11.         ColorTabs[i].rgbBlue = (BYTE)nNewGrayColor;  
12.         ColorTabs[i].rgbGreen = (BYTE)nNewGrayColor;  
13.         ColorTabs[i].rgbRed = (BYTE)nNewGrayColor;      
14.     }  
15.     pImage->SetColorTable(0,nColorTableEntries,ColorTabs);  
16. }