For lossless rotation, add jhead (pkg available) to the mix. `jhead
-autorot *.[Jj][Pp]{,[Ee]}[Gg]` reads the orientation tag and rotates
your images (lossless) if required. I have a scipt that automates
grabbing the pictures from CF/SD and rotating them using a similar
command before storing them in my archive.
Paul 'WEiRD' de Weerd
On Thu, Oct 08, 2009 at 11:48:32AM +1300, Paul M wrote:
> As far as I'm aware, you wont get lossless jpeg rotation.
>
> There does appear to be an orientation tag of some sort in the jpeg
> header, so rewriting that could cause a jpeg to be displayed with a
> different orientation. I'm not aware of any software that will do
> this however.
>
> All editors that I've seen will re-encode a jpeg whenever any change
> is made. Whenever that happens, you'll lose information.
> (Actually, lossless jpeg encoding is possible but I've never seen a
> publicly available app or library that impliments it.)
>
>
> paulm
>
>
>
> On 8/10/2009, at 10:38 AM, Frank Bax wrote:
>
>> I'm looking for basic image editor: crop, resize, lossless jpg
>> rotation.
>>
>> Something minimalistic would be nice, so GIMP is out.
>
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