http://www.shortcourses.com/display/display2-14.html and some thousand sites will get you going but the issue is not the quality of the camera most of the time. Fabric is going to push the DPI down to the few hundred area so at 200 DPI for a 8x11 print we get all of 3.52 megapixels or your average 4 megapixel camera will do fine.