The next time you're wondering how you should save a file out, ask yourself some questions. Is this image mostly lines and large areas of flat color? If the answer is yes, choose GIF or PNG. If the answer to your question is no and the image looks more like a photograph, then choose JPEG or PNG. While PNGs work well for both types of images, Keep in mind that the resulting files are usually larger, and PNG support is still fairly spotty. Most 3.0 version web browser will require a plug in to display a PNG.
Armed with this information, you should be able to choose the best file format to use for a specific graphic. Remember that these are not hard and fast rules, but guidelines designed to assist you with your choices. Be sure to experiment. Every image is different, and each should be treated as unique. You never know what you might be able to do to minimize file size until you try.
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