Photo DVD: Saving images to DVD-ROM not working

Question

When creating a photo slide show In iDVD, there is an option to save the photos to the DVD-ROM portion of the disc so that viewers can download them to their own computer.
After I created a photo slide show in iDVD, it played just fine on both the computer and on a DVD player. But when I have the DVD in my computer's super drive and I try to access any of the photos (jpeg files) that are on the DVD-ROM portion, I get an error message saying they can't be opened.
What am I doing wrong?
I have iLife 09 with iDVD version 7.1.2. My OS is Lion 10.7.2.

Answer 1

> 8mp camera and I have the images saved in TIFF which are 22.9m in size
That makes no sense.
> So resolution is not an issue.
Yes it is.
There are 2 issues here: file format and image size/resolution.
The best format depends upon what the print shop will accept. Often, JPEG is the only option and simply saving at the highest quality will give excellent results. If the option is available from the shop, give them a non-lossy format - TIFF is probably best.
With image size it's all down to pixels and looking at th epixel size of your image is what matters. The "resolution" [PPI value] is simply the ratio of pixels in the image to inches on paper. So long as you PPI is at least 200 and no more than, say, 600, you are OK. Print shops operate in 2 ways:
The expensive ones will take your image and you tell them how big you want to print and they do it.
The cheaper ones require the image be carefully prepared to be the right size - i.e. have the PPI set so that the size in inches is right.
In my experience, the cheaper ones, while requiring more work, often produce the best results.
If you are in the UK, email me [colin_walls AT yahoo DOT com] and I will direct you to an excellent mail-order printer, who is cheap, reliable and produces excellent results. [I have no business connection with them, except that I'm a happy customer.]