Best rotation tool to straighten the horizon ?!

Started Feb 13, 2010 | Discussions thread
Forum MemberPosts: 81
there is no lossless arbitrary-angle rotation
In reply to carleij, Feb 13, 2010

carleij wrote:

Need suggestions for a high-quality JPG lossless (freeware, if possible) rotation tool to straighten the horizon (which I manage to get crooked most of the time).

Lossless rotation of any raster image is only possible for even 90 degree increments. Rotation necessary to level the horizon (typically 1-5 degrees) invariably requires the image to be re-sampled, and that, no matter what, leads to degradation. The amount of degradation depends on the re-sampling method and parameters; these can sometimes be adjusted in order to make the degradation tolerable. While you can experiment with different software packages and settings, by far best strategy is to avoid the need to do it.


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