As per the title, which stack exchange would be most appropriate for an image processing question?
Both are computer software — well, Super User is the place to ask, definitely.
Check out our existing questions for:
If you instead want to do image processing using some programming language, Stack Overflow would be better.
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1Note that IIRC Gimp is scriptable. While it could be argued this is programming, we usually also accept questions about it. See e.g. VBA in Excel questions, or shell scripting. – Daniel Beck♦ Apr 23 '12 at 7:47
There's also a Graphic Design Stack Exchange:
Graphic Design is for questions targeted toward 2D design professionals, students, and enthusiasts.
This includes questions about:
- Graphic arts theory and history; "Why" we do what we do and not necessarily the "how" in logo design, fonts & typography, visual communication
- Web design
- Layout and printing
- Illustration
- Digital media
Examples: video, Adobe Flashbut not about:
- Simple "How to" questions
- Brainstorming or idea gathering
- Technical questions related to 3D software
- Technical questions related to video editing software
- Web site architecture and development
Examples: HTML that doesn't include CSS, server-side issues- Landscaping and architecture