title: Can a JPEG compressed image be rotated without a loss in quality?
body: <p>JPEG is a lossy compression scheme, so decompression-manipulation-recompression normally reduces the image quality further for each step. <strong>Is it possible to rotate a JPEG image without incurring further loss?</strong> From what little I know of the JPEG algorithm, it naively seems possible to avoid further loss with a bit of effort. Which common image manipulation programs (e.g. GIMP, Paint Shop Pro, Windows Photo Gallery) and graphic libraries cause quality loss when performing a rotation and which don't?</p>