Ric

Hello guys, i'm not an expert of those kind of programs and i'm not even an english speaker, so i apologize for the poor explanation of my question. I would like to use Affinity (Photo or Designer doesn't matter, i got both) to draw a contour around an image that i select with the selection brush (or other tools, idk) to obtain an effect similar to the attached image (i mean the white line around the two guys that clearly replicate and emphasize the selection). Is it possible?