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You're welcome, I'm glad I could help.

Thanks for asking again, this way I can better tell what details to go into. I was guessing a lot before. *g*

1) No, you don't have to do anything different with caps than with other images. You always assume that the images you start with have correct aspect ratio, so there's no difference. (There's often a difference in lighting, since caps are always too dark, whereas photo shots are always well lit, but that's another topic. ;))

2) One point that I didn't seem to have been very clear on is that you shouldn't have to calculate any aspect ratios yourself (sorry for giving you Math trauma. ;)). We always assume that the aspect ratio in the pictures we use is already correct, so all we have to do is not break it.

Here's an official gimp help page that funnily seems to do exactly what we need: https://docs.gimp.org/en/gimp-tutorial-quickie-crop.html

Why didn't I find that page before? :)

The aspect ratio of an icon is 1:1 (width and height are the same: both 100).

If you just resize any image to 100x100 (without cropping it to a square first), and the width and height of the original image were not the same, it will look ugly. It will squish people's faces, making them either too thin or too wide. That is what we want to avoid. At all costs. :D

So you have to make sure that when you crop an image, you set the aspect ratio of the crop to 1:1. You can also use 100:100, doesn't matter, just the two numbers have to be the same. And 1:1 is fastest to type. This way you get a perfectly square selection.

Then you can crop and you have a square image. The size will still be wrong, but it will be square.

That way, when you scale it down to 100x100, the aspect ratio of your original image will be preserved. Done!

Does this make sense (and work without giving you a headache :))?