Huawei Mate 9 - Manual (Page 151)

Undo changes
Rotate vertically
Mirror image
Swipe screen to rotate image
Portion of image to preserve after rotation
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Crop an image : Touch to select the crop ratio (for example, 16:9). Drag the dotted
edges to crop the image to the desired size.
Crop proportions
Crop selection
Crop grid corner
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Add a filter: Touch and select the desired filter.
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Accentuate colors: Touch anywhere on the image to select a color you want to
accentuate. All other colors will be converted to black and white.
Camera and Gallery
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