I have been wipping up some icons to use for my custom universal actions to match the stock ones. I tried looking online for any icon dimension guidlines but, having found none, I opted to screenshot the icons (used the reveal in finder one) to get the pixel size. However, there must be something that I am missing because when I upload my own icon the result is not pixel perfect but rather creates 'fuzzy' edges; even for straight lines. I am currently using 44px by 44px but I have also tested 42, 43, 45, 46 and they all give the same results. Am I doing something stupid or is there no solution?
TD;DR: uploaded icons for universal actions don't retain pixel perfect lines