Acer Film Scanner - Manual (Page 35)

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Rotate button
Click this button to rotate the image 90 degrees clockwise. You
can click this button several times to get the image orientation
you want.
Mirror button
Click this button to get a mirror reflection effect on the original
as if you were viewing the image in a mirror:
Crop button
Use this tool to cut only the needed area from the original
image.
To crop the image, you will want to first select the desired area
by moving, adjust the dotted rectangle in the Preview Area,
then push the Crop button.
Original image Image after Mirror is applied
Original image
Cropped image