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

There is a program named jpegtran

jpegtran – a utility for lossless transcoding between different JPEG formats.

To rotate the image losslessly, you can do the following:

$ jpegtran -rotate 180 -perfect -outfile rotated.jpg origin.jpg

And Here is a list of applications which provide the JPEG lossless rotation feature based on the IJG code