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What are the image formats that can be displayed on a web browser? What are some formats that cannot be used on a web page? which format is best suited to display each of the following and why:
A colour photograph on a web page;
A two-colour navigation button.
besides the nice link in the comment for Website Image Formats: Choosing the right format for the right task
many people don’t know about 8-bit PNG, which is usually better than GIF in size… there are tools to minimize the size of PNG, such as PNGOUT: http://en.wikipedia.org/wiki/PNGOUT
note that PNG won’t support animation like GIF does. 8 bit PNG only has binary transparency but not alpha transparency… if you google for 8-bit PNG, PNG8 or PNG/8, there will be lots of info.