for (i = 0; i < (Image->Width * Image->Height); i++) {
Sum += (Image->PixelData[i].r + Image->PixelData[i].g + Image->PixelData[i].b);
}
for (i = 0; i < (Image->Width * Image->Height); i++) {
Sum += (Image->PixelData[i].r + Image->PixelData[i].g + Image->PixelData[i].b);
}