Recently I had to deal with a situation that I’ve some how managed to avoid for a surprisingly long time: merge conflicts due to mismatched binary files, in this case image files. Now Git being Git, there are a number of equally viable ways of resolving any given problem - and thinking back, I do slightly regret not giving more time to investigating the arguably cool-sounding git mergetool. In general, binary files can be a bit of headache with Git due to the difficulty of dealing with their diffs. This can be a cause for concern due to the need to manually resolve some issues further down the line, although there is help out there.
That said, diffs aren’t so much a problem with image files. In my case, I made use of git checkout using the --ours and --theirs options, for instance git checkout --ours -- myfile.png. Appending one or the other option to git checkout allows you to checkout your or their committed file respectively. This saves you the effort of resolving the merge conflict manually.
All the best,
Tom