Graphics programs
Photoshop - especially for photos, transparent images a snap, lighten, clean photos, crop, enlarge, etc. How would dpaint do with a 7 MP jpeg? Is there anything on the Amiga that would handle an 8 MP raw image? Photshop does without skipping a beat.
TV Paint - The Amiga version is missing two thirds of the features of the Mac or PC version, (scanner support, mp3 support, Multiplane camera, Rotating project, Toon Shadding, Add Border, Scan Cleaner, Lens Flare). You can't even do animation in the amiga version.
Illustrator, curves, automatic colour harmonies, tracing, this is the key with illustrator, take a bitmap image and trace it making a vector based image.
Fireworks, the web developers tool, add hotspots, etc. It's vector based like photoshop.
I can't take a camera, download the photos and edit them on an Amiga, pretty standard stuff. I can't develop website images etc.