Each image on a Photo CD is stored in an Image Pac file format with five different resolutions. This feature saves much time in that you do not have to open, decompress a large file then resize and crop the image when you only need a passport size image for a newsletter. Five resolutions are included in each Photo CD Image Pac file. People who are engaged in commercial work will be interested in higher quality images. For a multimedia project you may only need medium-resolution, because a 13 to 15 inch computer screen has a resolution of 640 x 480 pixels.
Medium resolution is also acceptable for publication in journals.
For example, if you are using a Photo CD with a video project, the image must match the resolution of the screen. Compatibility What you get from processing your film is a gold Photo CD disk that you can put in your CD-ROM drive. I am using pictures taken in a classroom and importing them into a presentation software package, Aldus Persuasion, in preparation for a talk I'm giving at a conference. Aldus Persuasion is a presentation package that can read Photo CD images directly. When working with image editing or paint software, the higher the resolution the longer it takes to open.