Use Photoshop to convert images from the print version for use on the CPJ website.
The options for the files are to convert them to JPEG or GIF or PNG:
Use JPEG for photos, GIF for line art, cartoons, image that have a lot of text and/or large areas of one color. PNG works well and is a more recent image type but can generate large file sizes. So recommended is JPEG or GIF in most cases.