Originally Posted by Swampy
Too add one more item to Lurch's check list. There is a fly out menu in the upper right corner of the Save for Web preview window. Pop that out and select "Use Document Color Profile". This will help retain the actual colors of the image.
If you're only saving for the web and not for printing, and the color profile of the image is already the same as your working profile in Photoshop, I'd suggest not to include the color profile and save the image as untagged. It makes sense to include a color profile to the image if the target audiences are PC users browsing with Firefox or IE, but color profiles aren't handled the same way in Safari on a Mac. What lookss good in Firefox or IE may not appear the same in Safari and vice versa. Getting rid of the color profile keeps the image consistent in all browsers and also keeps the file size a bit smaller. Just a suggestion.