The main reason 'save for the web' can very easily trash out pics is that by default it reduces the dpi from whatever (300-600 dpi) in the original to72 dpi in the output pic.
Who hasn't bought a photo CD with reasonably good lookin' sample pics online, only to discover that 5-10 % of them are 600 dpi on the CD. Reduce them to 72 dpi and they revert to their true size, just thumbnails. The dpi has been increased to make them look like a full sized image.
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