>printing as a PDF
don't print to PDF, instead save it as a PDF.
then open the PDF in PS, when you get the dialog in PS choose images and select the image that you are looking for.
Export for Web from Powerpoint. It will generate a collect for output of the images in the document at file resolution. At that point, you can determine if your images are garbage or not.
That's a good method for easily finding the images, but I find that it doesn't leave the image intact as the original imported rez and file type. Often it will drop it to an indexed gif etc.
regards and happy 4th
It should. I have always found that it will do a direct collect and not down sample.