Did you know that the Preview app has a set of image adjustment tools that you can use to edit your images? While professional photographers might prefer to use tools such as AdobePhotoshop, Adobe Lightroom or Apple Aperture, for many folks, the adjustment sliders in the Preview app are more than sufficient (and much more inexpensive, with “free” being the keyword). They are also idea for quick edits.
Open the image you wish to edit and choose Tools > Adjust Color from the menu. A slider panel appears from where you can modify the Exposure, Highlights, Contrast, Shadows, Saturation, Temperature, Tint, Sepia and Sharpness. Drag the sliders to the left and/or right until you have attained the desired effect. Typically, dragging a slider to the left provide a darkening effect, while dragging to the right lightens the image. The panel even includes a Levels pane, from where you can adjust the highlights, shadows and mid-tones. If you want to go back to your original settings, click Reset All to revert back to the default adjustments.
When finished with your edits, click Save — and your done!
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