Pros may also have equipment for transferring digital images directly to slide film. This kind of equipment is often used by people who need slides prepared from Powerpoint files. You can use PICT,GIF, and JPEG files as desktop pictures, if you have MacOS 8.0 or above, or if you have the shareware desktop picture utility, Decor. You can E-mail pictures to your friends, also, as attachments. In some cases, attachments get garbled.
Internet technology is still crude in some ways.
If not, you may nned Graphic Converter. Save it as a file, and drop it on Stuffit Expander. If Expander does something with it, you may have your file fixed and ready to view. Have it developed and scanned professionally. Play with it.