Whooo!

Ok, when creating a normal JFIF from the Exif data, right before the 
EndOfImage marker (0xffd9) can be a number of 0x00's, which are not part of 
the data. If I strip these out, and append the 0xffd9 to the end of the data, 
I get a clean JFIF JPEG file which opens and displays with no errors 
whatsoever!

So now we have clean JPEG photo's, and clean PPM thumbnails. 

When the camera uses internal memory, it looks like the first data is directly 
the thumbnail (without any headers), but we know it is 12288 pixels (128x96) 
at 2 bytes per pixel, and after that should be the JPEG data.

It's worth a try, but I can't do it until I get home.

Then all thats needed is wrapping it in a Gphoto camlib.

Dennis :-)