The Chromebook photo editor is not a Chrome app, as you might think. It's integrated into the file manager. To use it, launch the file manager by hitting Ctrl+M, then navigate to where your photo is located.
Once you click on the photo you want to edit, two options will appear in the lower right-hand corner--View and Edit and Delete. Click on View and Edit to launch the photo editor.
You can allow Chrome OS to autofix the image or crop it.
You can also change the brightness and contrast, or change the orientation of the image.
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