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Message: <blockquote data-quote="MacBiter" data-source="post: 1947605" data-attributes="member: 421638">Any graphics editor will do that to a greater or lesser extent. For example Photoshop or Affinity Photos would do a really good job, but there are plenty of lower priced apps such as Pixelmator, and the shareware program GraphicConverter which has been around forever and is highly regarded.But before you do anything else, why not try the free Preview app that comes with all Macs? If you go into the Tools menu and click Adjust Color, you will find an adjustments window where you can do stuff like adjust exposure and levels, saturation, contrast, sharpness, hue, temperature, all kinds of things. Then there's the Photos app which also has some very effective adjustments, even more than Preview.</blockquote>