下面是主要的BMP图像处理程序。我的BMP图像为320*240
BOOL WINAPI ConvertToGrayScale(LPSTR lpDIB)
{
    LPSTR lpDIBBits;
    LPSTR lpNewDIBBits;
    LONG lLineBytes;
    unsigned char *lpSrc;
    unsigned char *lpdest;
    unsigned char *ired,*igreen,*iblue;
    long lWidth;
    long lHeight;
    long i,j;
    lWidth=::DIBWidth(lpDIB);
    lHeight=::DIBHeight(lpDIB);
    RGBQUAD *lpRGBquad;
    lpRGBquad=(RGBQUAD*)&lpDIB[sizeof(BITMAPINFOHEADER)];
    if(::DIBNumColors(lpDIB)==256)
    {
        return TRUE;
    }
    if(::DIBNumColors(lpDIB)!=256)
    {
        lLineBytes=WIDTHBYTES(lWidth*8*3);
        lpdest=new BYTE[lHeight*lWidth];
        lpDIBBits=(LPSTR)lpDIB+sizeof(BITMAPINFOHEADER);
        for(i=0;i<lHeight;i++)
            for(j=0;j<lWidth*3;j+=3)
            {
                ired=(unsigned char*)lpDIBBits+lLineBytes*i+j+2;
                igreen=(unsigned char*)lpDIBBits+lLineBytes*i+j+1;
                iblue=(unsigned char*)lpDIBBits+lLineBytes*i+j;
                lpdest[i*lWidth+j/3]=(unsigned char)(*ired)*0.299+(*igreen)*0.588+(*iblue)*0.114;
            }//总是在这个地方出错，我调试了下发现*((unsigned char*)lpDIBBits+lWidth *3*( lHeight -1)+ lWidth *3-1);这个值就已报错，为什么？每个点都是3基色呀。。。
            LPBITMAPINFOHEADER lpBI;
            lpBI=(LPBITMAPINFOHEADER)lpDIB;
            lpBI->biBitCount=8;
            for(i=0;i<256;i++)
            {
                lpRGBquad[i].rgbRed=(unsigned char)i;
                lpRGBquad[i].rgbGreen=(unsigned char)i;
                lpRGBquad[i].rgbBlue=(unsigned char)i;
                lpRGBquad[i].rgbReserved=0;
            }
            lpNewDIBBits=::FindDIBBits(lpDIB);
            lLineBytes=WIDTHBYTES(lWidth*8);
            for(i=0;i<lHeight;i++)
                for(j=0;j<lWidth;j++)
                {
                    lpSrc=(unsigned char*)lpNewDIBBits+lLineBytes*i+j;
                    *lpSrc=lpdest[i*lWidth+j];
                }
                delete lpdest;
                }
    return true;
}
在线求答案，跪求！！！！

图像的知识好深奥