[Digikam-users] Is jpeg rotation loseless?

[Florian Lindner]

Am Samstag, 10. Juni 2006 19:21 schrieb Gilles Caulier:
> Le Samedi 10 Juin 2006 18:04, Florian Lindner a écrit :
> > Am Samstag, 10. Juni 2006 16:23 schrieb Dudas Gabor:
> > > Florian Lindner wrote:
> > > > Hello,
> > > > is the jpeg rotation in digikam loseless or not?
> > > >
> > > > Thanks,
> > > >
> > > > Florian
> > > > _______________________________________________
> > > > Digikam-users mailing list
> > > > Digikam-users at kde.org
> > > > https://mail.kde.org/mailman/listinfo/digikam-users
> > >
> > > I can only quote from an email from 2 days ago:
> > >
> > > *************
> > >
> > >  >>> About the rotation: Is it done in a "losless" way? Or with
> > >  >>>
> > >  >>> > > > recompression?
> > >  >> > >
> > >  >> > > The CameraUI is lossless. The image editor is pixel-based and
> > >  >> > > thus lossless if you save back to JPEG. For already downloaded
> > >  >> > > images, use the
> > >  > >
> > >  > > Sorry, thats of course not true what I wrote here. Corrected
> > >  > > version: "The image editor is pixel-based and thus lossy if you
> > >  > > save back to JPEG"
> > >  > >
> > >  > > kipiplugin and cameraUI rotation is lossless, but JPEG specific.
> > >  > > The image editor supports lossless PNG.
> > >
> > > And tiff of course.
> >
> > And how can I tell when I use the image editor rotating feature and when
> > the feature from a KIPI plugin? The rotation I can do from a thumbnails
> > context menu. Is this done by a plugin or by the image editor?
>
> By a kipi plugin.

So can you take it the way that every rotation that is not done by "left click 
on an image -> transformations -> rotate" is loseless?

Thanks,

Florian