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  1. How to rotate image by less than one degree?
  2. Which free software can I use?
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closed as not constructive by ChrisF, Indrek, Ƭᴇcʜιᴇ007, HackToHell, Breakthrough Nov 13 '12 at 12:34

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How to? Simply enter 0.5 (or what ever the angle you require) into the dialog. Which software? Most would have this feature I'd expect. –  ChrisF Nov 13 '12 at 11:41
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The most known free image manipulation software should suffice: GIMP –  Ярослав Рахматуллин Nov 14 '12 at 2:53

2 Answers 2

up vote 2 down vote accepted

Rotating with fractional degrees isn't something special. If a program doesn't allow it, it's probably a UI design choice of the developer.

IrfanView, for example, supports fine rotation:

rotate dialog

IrfanView is freeware and it supports both automation (via command-line options) and batch processing.

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Since you are talking about an image I would suggest a rotation matrix. See here for an example: http://en.wikipedia.org/wiki/Rotation_%28mathematics%29#Two_dimensions You can use arbitrary values as angle argument.

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There's no indication in the question that the OP is coding a solution. Equally there's no indication that they're using some image processing software to do this either. –  ChrisF Nov 13 '12 at 12:25

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