Image rotation is performed by computing the inverse transformation for every destination pixel. Output pixels are computed using bilinear interpolation. RGB images are computed by evaluating one color plane at a time. There are no gamma corrections so purists might want to correct for image gamma before and after rotation.


An original image that you might want to rotate.


A five degree counter-clockwise rotation with bilinear interpolation produces an image that is slightly larger than the original surrounded by black regions that do not map to any pixels in the original image.




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