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When creating images for the Web, you have to observe certain rules and best practices. First, the images have to be physically small, rarely larger than a few hundred pixels in either dimension. Print size by the way is irrelevant. The images can't have layers or other excess data. You are permitted just three file formats, JPEG, GIFF and PNG, and if you want your colors to survive with any degree of accuracy, the color space should be set to sRGB. Fortunately, the Save for Web and Devices command takes care of most of these issues for you.
It flattens the file, removes the excess, keeps copyright and other important metadata, directs you to the proper formats and converts the image to sRGB. All you have to do is scale the image, which is often times better performed before choosing Save for Web than after. I demonstrate each and every step in the process as well as provide guidance for which file format to use when, in the following exercises.
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