Forum Moderators: not2easy
well as usual it depends of various things, but i think that a jpg format is perfect for what you offer...
one advice could be use a small picture in the page and the posibility of a bigger one with a click or something like that. In this way, the user can take a loor or almost every thing faster than with a big and high quality picture and choose to se it better or not.
Hope it helps
Bye
Hope that helps