If so, how?

James

I'm not sure about editing the actual file, but it's created from the book's cover, and it's very easy (for a MobiPocket book, at least) to change the cover of a book using tompe's "mobi2mobi" tool.

I think they are just raw 4-bit images. You can generate them with some programs or scripts, have a look at this thread: http://www.mobileread.com/forums/showthread.php?t=21998

I think they are just raw 4-bit images. You can generate them with some programs or scripts, have a look at this thread: http://www.mobileread.com/forums/showthread.php?t=21998

If they are just 4 bit RAW images, then you can use an image editor like "Paint Shop Pro". With it you can crop, change the size, change to gray scale, change the color depth to 4 bits and save a RAW. I'll try one tonight to see if that will work.

EDIT; Apparently this does not work & I have doubts that the t2b is, in fact a 144x96 RAW image. When I copy & rename one to "name.raw", I can view it in Paint shop Pro but it shows as 4 very small images. PSP only wants to work with 8 bit files.

It's not a 4-bit image but a 2-bit one - 4 grey scales.

Obviously some people have got it to work. When I tested and put an image in the Cybook and then generated the t2b file the thumbnail was still regenerated when I opened the library. What I wanted to do was to eliminate the time it takes to create the thumbnails.