To the best of my memory, 20 KB is the sweet spot.
Make album art too large, and some devices will not display it. And by too large, I mean the actual file size on disc.
What affects files size? Number of pixels, dots per inch resolution, file type, and the application creating the file.
I've used two graphics programs for a very long time: CorelDRAW and GIMP.
With CorelDRAW, I can take an image from the Internet, resample it to 200 × 200 pixels and 72 DPI, and get a file of 40 KB.
With GIMP, I can take the same file and resample to the same size and resolution, and get a file of 20 KB.
I've wondered why for many years.
Does CorelDRAW wrap extra digital information around the file, something you wouldn't notice, unless you're dealing with very small files?
Does GIMP compress files behind the scenes?
========> ANYONE WHO KNOWS, PLEASE FEEL FREE TO CHIME IN! <================
I feel I've asked this once before, many years ago. Not sure.
I can install GIMP, again. It would solve a problem, but it won't help my understanding of the situation.
I really want to know why this happens.
Obviously, I like to find my own source of album art and get my hands dirty, as it were, so no suggestions regarding freedb, automatic downloads, and the like. Please.