I have 3,337 PNG images which all have a transparent background.
First of all, I don't know how to remove transparency...
Second of all, I want to do this with all 3,337 images at the same time.
I might as well kill two birds with one stone: How do I remove transparency from PNG images in GIMP in bulk (multiple items at the same time)?
convert transparent.png -alpha off not_transparent.png