Should square jpeg avatars (or gif/png) be scaled down to 2^n or at least 123x123?

Question

Images

Friends, tell me. Should the historical 32x32, 128x128, 256x256 and other such "round" sizes be supported? What can it give? Improved rendering on resize? Smaller size for the same quality?

Answer 1

"Round" sizes will not give any profit,
but it makes sense to make the size a multiple of the DCT size. like 8x8 or something like that)

Answer 2

What's stopping you from doing your own research? It would make a good article.

Answer 3

In the picture on the left, the avatar is scaled 256 -> 128. On the right - 256 -> 111.

There is a difference. But in small pictures, I think it will not be felt.
The main thing is to scale them proportionally. It's not enough to kill a webmaster for violating the proportions.