My view is that you should avoid shooting in JPG whenever possible, unless your target output requires it and you have little to no opportunity to process your images before they arrive at the final destination. Otherwise, you are only compromising your own work by going straight to JPG. The only exception I would make to this statement is if you are darn good at setting your camera's image controls and selecting the best possible exposure all the time. Now, if you are only out to make pictures to make small prints, send to a news agency, or post on-line it is less critical. But, in all other circumstances I see shooting in JPG as unnecessarily handicapping yourself. A good compromise would be to shoot in RAW+JPG if your camera supports it.
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