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At this stage one may determine the angle which the page needs to be turned for the text to be properly horizontal. Since compensation is a simple rotation such distortions as keystone or curling can not be corrected at this stage. The rotation angle is determined automatically, but you can also set it manually.
Here is the working area in this mode:
Images can be rotated by dragging the round handles at the edges.
Here's what a panel of options looks like:
You can also explicitly specify the rotation angle in degrees. Positive angles will rotate the image clockwise, negative counter-clockwise. For fine adjustment of the angle it may be convenient to click the mouse on the text portion of the input field corner, then move the mouse wheel to fix it.
Links to all other stages:
Deskew (correcting tilted pages)