SRCCOPY 는 잘 되는데
SRCINVERT 를 하면 화질? 이 꺠지는데

이유를 좀 알고 싶습니다.

        BitBlt( Changed_BMP->Canvas->Handle, 0, 0,
            Screen->Width, Screen->Height, GetDC(0), 0, 0, SRCCOPY );
       
        BitBlt( Changed_BMP->Canvas->Handle, 0, 0,
            Screen->Width, Screen->Height, Before_BMP->Canvas->Handle, 0, 0, SRCINVERT );

        TJPEGImage *JPGImage = new TJPEGImage;
        JPGImage->Assign( Changed_BMP );

        JPGImage->SaveToStream( Stream );
        delete JPGImage;
                                 
        BitBlt( Before_BMP->Canvas->Handle, 0, 0,
            Screen->Width, Screen->Height, GetDC(0), 0, 0, SRCCOPY );