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A. Use JPEG
compression. Typically you will get about a 15:1 compression with
JPEG, and (if it is done properly) have no detectable loss of quality.
If you are using Photoshop, when you click
"save-as", then "JPEG", you will be asked for a file
compression number. Use 10-12, for highest quality (largest file
size, least compression).
JPEG artifacts almost always result from either (a) saving
at a lower compression number (e.g., less than 6), and/or (b) using a very
small file to make a very large print.
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