i have two images which my program loads, and if the program find a yellow pixel in either image, it test whether it's the same colour at the same position in the next image, throughout the entire image.

this checks to see whether one colour is the same in both images. to do this i have looped through using memcmp, but i am afraid my code is gonna be real slow, as i have many large images to test.

can anyone suggets things to make my code quicker?

cheers

int main(int argc, char* argv[])
{
// 1st image
HANDLE hBm1 = ::LoadImage(0, "C:\\Documents and Settings\\ftwyman.MARINEDATA\\Desktop\\1.bmp",
IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE | LR_CREATEDIBSECTION );
BITMAP bm1;
::GetObject(hBm1, sizeof(BITMAP), &bm1);
int size1 = bm1.bmHeight * bm1.bmWidth * bm1.bmBitsPixel / 8;
BYTE *bytes1 = new BYTE[size1];
::GetBitmapBits((HBITMAP)hBm1, size1, bytes1);

// 2nd image
HANDLE hBm2 = ::LoadImage(0, "C:\\Documents and Settings\\ftwyman.MARINEDATA\\Desktop\\2.bmp",
IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE | LR_CREATEDIBSECTION );
BITMAP bm2;
::GetObject(hBm2, sizeof(BITMAP), &bm2);
int size2 = bm2.bmHeight * bm2.bmWidth * bm2.bmBitsPixel / 8;
BYTE *bytes2 = new BYTE[size2];
::GetBitmapBits((HBITMAP)hBm2, size2, bytes2);

int i;
BYTE yellow[] = {0x00,0xff,0xff};

DWORD a = GetTickCount();
Sleep(100);
//for(a = 0; a <100; a++){
for(i = 0; i < size1; i+=3)
{
if(!memcmp(yellow, &bytes1[i], 3) ||
!memcmp(yellow, &bytes2[i], 3))
{
if(memcmp(&bytes1[i], &bytes2[i], 3))
{
break;
}
}
}
//}

cout << (GetTickCount()-a);

if(i == size1) cout << "matching!";
_getch();
return 0;
}