Honestly, GIMP feels like it's been getting rapidly more livable as a photo editor recently.
Like, I still wouldn't call it suitable for professional use, but it's been causing me noticeably less pain since they finally introduced some non-destructive editing.

Honestly, ENT looks pretty good. I mean, not as good as TOS remaster, but being done natively in 720p (and even 1080 in later seasons), it doesn't look that bad.