[klodolph]

If you’re dead-set on using FOSS, why switch to the Mac in the first place? Wouldn’t you stick with Linux and use GIMP (or maybe Krita, which is usually a better alternative)?

GIMP is not really a good image editor, when you compare it to the alternatives and include paid alternatives in the comparison. From my memory of using Photoshop, I’d say that GIMP is roughly equivalent to Photoshop 3.0, which came out in 1994, although it is missing some core features from Photoshop 3.0 (and prior versions—the workflows that I used in Photoshop 2.5 are unworkable in GIMP, as far as I can tell, and it’s extremely frustrating to try and use GIMP for basic tasks).