If all you're doing is tweaking icon-style graphics for web pages then Gimp is still a good choice. Where Gimp really starts to fall short is when you need colo

If all you're doing is tweaking icon-style graphics for web pages then Gimp is still a good choice. Where Gimp really starts to fall short is when you need color management, alternative color spaces, and bit-depths beyond 8bpp. For me personally this means that I don't use Gimp for photo editing; For that, I switched to Adobe Lightroom a few years ago. It's not open source, but it's inexpensive, it works very well, and has a feature set that's closely aligned to a photographic workflow.