You can export all your slides as image files in JPEG, PNG, or TIFF format.
Choose Share > Export and then click Images.
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 filename, choose a location for the files, and then click Export.
Each file is named filename.001, filename.002, and so on.
You can also send individual image files to iPhoto, as described in Creating an iPhoto Album.