03-30-2011 02:50 PM
That is a hard question without more information than you are giving. But my guess factor is often pretty good so, Check the size of your file and the dimensions of your picture (in Pixels) against what the program says it wants. (I don't remember off hand what the sizes are, all are different) you might also want to look at the pictures you are trying to upload in Photoshop or something similar (There isn't much similar to Photoshop :0) ) and see if you can see anything wrong there. It's also a god place to check your sizes.
You can see his books, get a link to buy them, and read a bio of the guy.
04-02-2011 11:27 AM
I believe it is approximately 500 x 700 pixels. Might be a little smaller or a little larger. You can also resize it in paint, as well as photoshop.