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Good Photoshop trick
An Avid editor just showed this tip using the Photoshop ruler
tool (you can find the ruler in the eyedropper icon).If you have something at an angle that you need to straighten –
like a crooked scan, click on the ruler, and draw a line from one
corner of the element to the other – so that the line follows
the angle.Then click on transform/rotate (edit>transform>rotate).
The numeric degree of the angle will show up on the transform menu.
If it’s a minus, replace the minus with a plus, and if it’s a plus, visa versa.
This wll instantly straighten your element.