Like Klondike said, take the largest size possible that the camera allows. But before you do that, check the settings on your camera. Some cameras have adjustments for .jpeg compression. Raw would be the best to save the file as but is not internet friendly so .jpeg format is favored. Doesn't matter if you shoot .jpeg, Raw and convert to .jpeg or edit .jpeg photos, make sure the output settings of the camera and the software you are using saves the file with no additional compression or as little compression as possible. Manually check all the settings before saving. Compression is not your friend if your looking for quality.
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