Can a JPEG compressed image be rotated without a loss in quality?

Question

JPEG is a lossy compression scheme, so decompression-manipulation-recompression normally reduces the image quality further for each step. Is it possible to rotate a

Answer 1

According to the excellent article on Understanding Digital Image Interpolation by Sean McHugh:

Interpolation also occurs each time you rotate or distort an image. (...) The 90° rotation is lossless because no pixel ever has to be repositioned onto the border between two pixels (and therefore divided).

and eventually concludes with

avoid rotating your photos when possible; if an unleveled photo requires it, rotate no more than once.