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Graphic files for website use require much lower resolution than for an advertisement, catalog, or brochure. Generally, web file resolution is 72 dpi (dots per inch) while print work requires 300 dpi for photo images. Web files are normally either 8 bit .gif files or 24 bit .jpeg files. GIF files are normally illustration files that require less colors than say a photograph and are usually smaller in size than jpeg's.
If you are doing a high-end print job, send your graphic files to your designer at the highest resolution avilable. You can compress them using a utility program such as Stuffit or PKZip in order to email them, or burn them to a CD.
Photographic images are adequate at 300 dpi. Avoid resizing your images. Making a very small image larger only decreases the resolution at the new image size.