You can turn your slideshow into an iPhoto album, with each slide a separate image file.
Choose Share > Send To > iPhoto.
Specify whether to create a file for every slide or only a range of slides.
To create a separate image for each build stage, select “Create an image for each stage of builds.”
Choose an option from the Format pop-up menu.
The better the quality, the larger the file size.
If you choose JPEG format, use the Quality controls to specify a percentage between low and high quality.
Click Next, type a name for your album, and click Send.
If iPhoto was not already open, it opens; your new album appears at the bottom of the list.