[Digikam-users] Lossless rotation is lossy!

[Gilles Caulier]

The JPEG transform operated from digiKam IconView is lossless. It use
standard LibJPEG lossless code, as you can see here :

https://projects.kde.org/projects/extragear/graphics/digikam/repository/revisions/master/show/libs/jpegutils/libjpeg-80

It's the same from digiKam Import Tool.

>From BQM, it's not yet...

Best

Gilles Caulier

2014-04-13 23:56 GMT+02:00 Bast! <bast at abwesend.de>:
> Hi Gilles
>
> The current functions are NOT lossless! They have small but measurable
> difference. In Gimp I put the original and the rotated version in two
> layers on top of each other, chose difference as layer option and
> adjusted the color values until i saw the difference.
>
> When compared to the really lossless rotation of irfanview I can say
> that both batch rotation and the rotating buttons of Digkam do in fact a
> _lossy_ rotation.
>
> What am I doing wrong?
>
> Bast!
>
> Am 13.04.2014 21:13, schrieb Gilles Caulier:
>> JpegLossLess plugin have been disabled in digiKam since a long time. A
>> core solution is used instead and is shared with BQM. All functions
>> previously available with JPegLossLess still here, but without to use
>> the plugin.
>>
>> Best
>>
>> Gilles Caulier
>>
>> 2014-04-13 17:45 GMT+02:00 Bast! <bast at abwesend.de>:
>>> Hi
>>>
>>> I cannot find the Kipi plugin JpegLossLess in Digikam and therefore have
>>> only the lossy rotation of any kind. The documentation refers to this
>>> plugin but I cannot find it.
>>>
>>> I am running kubuntu 12.04.04 LTS, Kubuntu 13.10 and Ubuntu 13.10 in a
>>> VM, updated the kipi plugins and digikam to 3.5.0 on all three.
>>> Setting up kipi-plugins-common (4:3.5.0-0ubuntu10) ...
>>> Setting up kipi-plugins (4:3.5.0-0ubuntu10) ...
>>>
>>> Even the jpeglossless plugin was installed, I think:
>>> /usr/lib/kde4/kipiplugin_jpeglossless.so
>>> /usr/share/kde4/services/kipiplugin_jpeglossless.desktop
>>> /usr/share/locale/es/LC_MESSAGES/kipiplugin_jpeglossless.mo
>>> ...
>>>
>>> But it is not shown in the Configuration of Digikam under Kipi-Plugins.
>>> How do I get the lossless JPEG rotation to work under digikam?
>>>
>>> Thanks in Advance
>>> Bast!
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