Importing full-page images into iBooks Author (without image degradation)

Hi ,, I have had little success importing images created with paint programs such as Corel Sketchpad, Photoshop, Corel Painter, etc. Everything seems to work just fine, but there are pixelated artifacts in the final image that shows on the iPad. I create the orginal images at 1024 x 768 ... and save them as high-qulaity jpgs and pngs .... but still poor qualiting especially where large blocks of solid colors are adjacent to one another.
When I use a vector program such as Flash or Illustrator and export those images as jpgs ... they look perfect on my iPad. I don't want to use a vector program however ... I want to use paint programs.
Anyway have success with paint program images? If so, what is your step-by-step process? Hopefully Apple will fix this bug so that paint program's exported jpgs don't have pixelated artifacts at edge areas. There is also a very noticeable color shift in the imported image .. much ligher and less saturated colors.
In the image below you can see the imported image showing artifacts and the orignal image is not showing artifacts.
Thanks, Frank

An iPad 2 screen is 132 - new ipad is 264.
In cases where you're seeing noticable degradation I wouldn't work with less than 132.
Start high and reduce....don't try to make low do something it can't by simply adjusting the resolution up.
I tend to avoid those 'paint programs' And remember, this isn't just about iBooks Author....iOS does the heavy lifting, but sure, it can only do as good as iBA spits out. I think they're working to trim the sails on compression etc. and it will only get better over time.
The @2x scheme is working well for iOS - I have some stunning graphics for the new iPad in my latest app.
Good luck.

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