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Re: image-dired: Check all external programs available

From: Tino Calancha
Subject: Re: image-dired: Check all external programs available
Date: Sun, 4 Sep 2016 22:49:43 +0900 (JST)
User-agent: Alpine 2.20 (DEB 67 2015-01-07)

On Wed, 31 Aug 2016, Mathias Dahl wrote:

      As you know, 'convert' also can rotate an image.

Yes, it probably can, but as I remember it, the rotation is lossy, i.e. it 
makes the JPEG data worse than before the rotation.
jpegtran was able to do lossless rotation, which is why I picked it. For 
thumbnails it would not matter but for rotating original
files it's not nice to loose information/quality. As long as users can get hold 
of jpegtran I think it should be the default
program used for rotation.
Thank you very much for the explanation.
I have pushed the changes to the master branch as commit ca473907

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