Why are there so many different image formats on the Web?

For their protection so that no one can copy their format and it is for art sake , a new format everymonth is a refreshing to the eye of the customer.

he he.. because internet user have many various internet speed also some people looking for high quality images and low quality. the format can be used for play on it, choose high quality and low speed loading or low quality but more speed on loading. :)

Out of many reasons imp. ones are.... *money *practicality. Some file format developers (such as CompuServe with GIF) try to maintain some level of control over their formats. Other users and developers, of course, do not wish to submit to this and so they develop their own formats. *For file to be high quality but very small,JPEG is good. *For maximum quality, RGB is a good choice. *For maximum compatibility, GIF and PPM are good choices because they are very broadly used. *For printing, PostScript is the clear standard and often you must convert your file to PostScript before printing it (or the printing software will do it for you). *The list of formats and specific advantages goes on and on so use that format which is best for your individual application.