Huawei MATE 9 Use Manual page 151

Crop an image : Touch
l
edges to crop the image to the desired size.
Add a filter: Touch
l
Accentuate colors: Touch anywhere on the image to select a color you want to
l
accentuate. All other colors will be converted to black and white.
Portion of image to preserve after rotation
Swipe screen to rotate image
Undo changes
Rotate vertically
Mirror image
to select the crop ratio (for example, 16:9). Drag the dotted
Crop selection
Crop grid corner
Crop proportions
and select the desired filter.
Camera and Gallery
145