Step 8Straighten the Image
Most of the time you will find you need to rotate the image 2 or 3 degrees to make the part look straight.
For IrfanView, press F12 to bring up the paint tools window. Choose the straighten tool, trace a line on the part which should be vertical. This rotates the image.
In the GIMP, drag a guideline or turn on the grid. Now use the Rotation tool to free rotate the image.
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