Manual:$wgJpegTran

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Images: $wgJpegTran
Path to jpegtran, for lossless JPEG rotation.
Introduced in version:1.21.0
Removed in version:still in use
Allowed values:absolute path, or false
Default value:'/usr/bin/jpegtran'
Other settings: Alphabetical | By function

Details[edit]

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.