LOL, I loved making forgeries! Not sure how you worked out the calculations of accuracy but it certainly felt fair. Would love to see a meta where you're selling the forgeries and all the antics that would ensue as you potentially get caught. :D
So basically since it's a small canvas (16 x 16 ) ,I can compare every single pixel between the original and the forged one ,and to get the accuracy it's ( total matching pixels / total pixels ) * 100
