OK, so far it seems .tif format is preferred. If I wanted to submit an entry to a contest, then I could load the tif image (say in PhotoShop), reduce it in size if necessary, then save in jpg?! Is there any reason for not using the .pdf (native PhotoShop) format? Or don't you have PhotoShop? I'm just trying to figure if the tif format has more features available than pdf. Is there a concern about how big the tif files are? My 20GB hard drive gets a bit full sometimes.