Samsung GALAXY S6 User Manual page 138

3. Tap Edit .
 Enhancement tools display.
4. Adjust your picture with these tools:

Adjustment: Straighten and freely rotate your picture.
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Tone: Adjust the brightness, contrast, saturation, temperature, and hue of the picture.
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Effect: Add color effects to your picture.
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Portrait: Enhance facial features.
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Drawing: Draw or write on your picture.
Camera and Video 127