I would rather not as it would reveal my identity since I am automating for my group. However, you can imagine an icon size, a medium size, a large size image. I found storing the medium sized image worked the best across all size comparisons.
FYI any image with a lot of white in the background or really dark do not register as accurately.
I have also tried the last screenshot method but I find it is too limiting in possibilities to do other tasks before the image comparison.