Thanks, Michael!
Mangle prepares the image files, so that they are optimized for the Kindle DX, right? Great, that's the tool I needed.
I didn't know that Kindle DX could read ZIP files. That's great news to me. Right now I have a Cybook. Among other things, like small screen size, it would mix the piture files with books and everything. I could filter to display images only, but it would take a long time, because it had to render all thumbnails of each page in the library before I could select an image to view. I guess that ZIPed, it will show as a book in the Kindle DX, right?
Thanks for replying. Im closer to buy the Kindle DX.