Hi stants,
The dimensions of the pictures is 288 x 218 pixels. You shouldn't have any problem with the # of colours.
You could also use a free image program eg:
"Faststone Photo Resizer" which can batch convert pics from a directory all in one go to the same size whilst still keeping your original pics intact.
I don't have much time now but when I get back later I'll see if poss to make TAB autoresize a pic to fit in the box
Regards,
Phil.