Image Comparing and return Percentage

Question

int DiferentPixels = 0;
Bitmap first = new Bitmap(\"First.jpg\");
Bitmap second = new Bitmap(\"Second.jpg\");
Bitmap container = new Bitmap(first.Width, first.Height         


        

Answer 1

For speed, resize the images to something very small (16x12, for example) and do the pixel comparison. If it is a near match, then try it at higher resolution.

Answer 2

One obvious change would be call GetPixel only once per Bitmap, and then work with the returned Color structs directly:

for (int i = 0; i < first.Width; ++i)
{
    for (int j = 0; j < first.Height; ++j)
    {
        Color secondColor = second.GetPixel(i, j);
        Color firstColor = first.GetPixel(i, j);

        if (firstColor != secondColor)
        {
            DiferentPixels++;
            container.SetPixel(i, j, Color.Red);
        }
        else
        {
            container.SetPixel(i, j, firstColor);
        }
    }
}