RGB与HIS的转换

//取出各个像素的蓝、绿、红分量 lpsrc=(unsigned char*)lpDIBBits+lLineBytes*(lHeight-1-i)+3*j; b=*lpsrc; lpsrc=(unsigned char*)lpDIBBits+lLineBytes*(lHeight-1-i)+3*j+1; g=*lpsrc; lpsrc=(unsigned char*)lpDIBBits+lLineBytes*(lHeight-1-i)+3*j+2;