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With JPG compression, the amount of detail will affect the file size. An example is if you take a photo of an image with a gradation or lots of flat color, it will compress the file more than an image of the same size with LOTS of detail such as leaves or feathers. JPG looks for areas it can throw out redundant data like large blocks of color. If you sharpen an image it will generally not allow as much compression.
Keep in mind, files of the same format, i.e. .tif, .jpg, etc., saved from different programs may end up being different sizes. If you use Photoshop to make a JPG make sure you pay attention to the quality. 12 is the highest in Photoshop and therefore the "best".
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