ColorIt 4.0 is a great program. $50 via download, $55-CD delivery plus you get additional pattern libraries.
It's easy, intuitive, i.e., under Image>Scale you get a choice of inches, centimeters, pixels, picas, points. You can do it by percentage, or pick the size you'd like. Default is "Keep aspect ratio". The Filters menu offers 9 options, Sharpen offers Unsharp Maks, Sharpen 1 or Sharpen 2. IT OFFERS 16 LEVELS OF UNDO!! as the default. (Naw, I never make a mistake! )
I don't see where Microfrontier has updated for X, but I use it 9.1 most everyday, on the iMac 333 and a Performa 6400/G3-400-136 ram sure does make Photoshop a "stand alone" program
One complaint-it don't do text worth a flip. Needing to add captions, I usually save the jpg and open in AW, add the text, save as jpg and reopen in CI then print. AW is often "too blue" for my tastes.
Yes, it opens digital camera card formats, it has a catalog function, it does "change resolution", also with "keep aspect ratio", the manual is pdf, and there is a demo download.