Author Chapter 1 (Bocchi-sensei! Teach me Scanlation!)
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@Xunder help this guide doesn't use GIMP, what do?
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@Skankyslack I gave you Photoshop, use that instead :whip:
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W-why I can't spot any difference?..
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help, I'm stuck on ms paint
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but.. GIMP D:
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Um, why not just use the ruler tool to mark a straight line, then Image > Rotate > Arbitrary > OK? This will rotate it perfectly.

Skew is if the page was photographed instead of scanned, and there is (usually keystone) deformation from not holding the phone perfectly flat.
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Using GIMP is a viable alternative to Adobe Photoshop especially if you cannot afford the latter.