Bumping this up because I'm curious about the same thing, at least for paintings... placing up pics and some of them don't quite fit in square frames, but also don't fully fit and get squashed by vertical and horizontal frames, so I would like to know how I should letterbox/crop some of them.
243 days ago(+1)(-1)
You need an image with sides 1:1, any resolution, you just need to put your image inside leaving the areas transparent, I'll attach a picture.
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241 days ago(+3)
As far as I know there should be these proportions:
H - 160 x 128
S - 192 x 192
T - 98 x 128
V - 232 x 372