Currently Being ModeratedMay 13, 2013 2:17 PM (in response to annemarie engelhart)
If you have a slideshow on a DVD created by iDVD, it is possible the original picture files were added to a special folder on the DVD called "DVD-ROM." To check for this, insert the DVD into your iMac and then quit from the DVD Player software which usually starts playing the DVD automatically.
Open the DVD icon on your desktop so you can see the contents. There will always be a Video_TS folder, and if you're lucky there will also be a DVD-ROM folder with the photo files inside. These can be dragged to your hard drive. If the folder isn't there, you're likely stuck with lower-resolution screen shots of each photo.
There are a couple ways to get these screen shots. Literally, you can play the slideshow and use ⌘-Shift-3 (or use software like SnapZ Pro or Apple's Grab) to capture the image shown on your monitor. Or you can uncompress the video file on your DVD and use iMovie (or Quicktime Pro) to save a "frame" from the video as a picture file.