Instructions
Open your eBook, and select to print your eBook to JPEG images. Each page will be its own individual file. If you are using a photo editing program like Adobe's Photoshop, you can select to process multiple files and save them as JPEGs. You will want to match the resolution of your saved JPEG file to the resolution of your digital photo frame.
Transfer the folder containing your eBook to a memory card or directly to your digital photo frame.
Program your digital photo frame to allow for manual file advance, so you can change the page when you are done reading it. If your frame does not support manual advance, select the longest time as possible and adjust as you become more familiar in your reading speed.