Images: $wgJpegTran
Path to jpegtran, for lossless JPEG rotation.
Introduced in version:1.21.0 (Gerrit change 44005; git #e288e403)
Removed in version:still in use
Allowed values:(absolute path) or false
Default value:'/usr/bin/jpegtran'



Path to the jpegtran utility. Doesn't seem to be used for much (as of MediaWiki 1.22), other than to provide lossless rotation functionality in the MediaWiki API (see [1]). jpegtran is not even required for image auto-rotation.