While we can't give you a full lesson on Web photo preparation, here are some pointers to make your life easier. E-Commerce Issues Misc.
Photos are vital in retail online stores to motivate a shopper to press the order button.
So preparing photos for your online store shouldn't be an after thought. Both JPEG and GIF images display well over the Web, but download time is the biggest factor. For most catalogs your pictures will be photographic, so JPEG is probably the best choice overall. When in doubt, save the image in both formats and select the format with the smaller file size for the catalog. This depends upon how many product photos will be displayed on a single page.