10" IQ Digital Picture Frame: Blu...

Hello.
I just purchased a 1-" iQ Digital Picture Frame, model: IQ-DPF10BK and I'm having the following question/problem:
I'm rather new as to how to manipulate pictures to show properly on a dig. picture frame, if it requires any special skill or knowledge to do so. Well, at least, on this very unit.
I have some pics. that came on a memory stick which not only show at full screen but also the image is crisp and clear. The ones I'm trying to display are pics I took with a Kodak EasyShare camera. All pictures, no matter how I save them, either high or low resolution, seem to show the same way: They all seem to be a bit blurry and I cannot seem to find a way to make them show at full screen without using the zoom feature, but if I do that the slide show won't play.
When I view the pics on my computer they're just perfect. I also have some printouts of the same pics and they look just as good.

What would I be doing wrong or Is there a special way to take the pictures or to treat them before showing on this device?
Thanks!
Oscar