@David@supersid333@ryuuji if you took the screenshots yourself and still have the layered file, try adding transparency masks (or whatever they're called in the software you use) and hide each layer's edges using a big soft brush. In the extreme cases where the lighting changes during the shot, you can add really big gradients to blend the layers, but in most cases a soft brush around the edges is all it takes.
off-topic, but very useful technique: use the "difference" blend mode to align layers pixel perfect