[Digikam-users] What is the best way to rotate images?

[Caulier Gilles]

Le jeudi 18 janvier 2007 23:04, Achim Bohnet a écrit :
> On Thursday, 18. January 2007 22:04, Marcel Wiesweg wrote:
> > > My camera doesn't record orientation automatically so any photos I take
> > > in portrait view are always displayed in landscape. I want to change
> > > them all to the correct view permanently so they display correctly
> > > whatever program I open them with. They are a mix of jpeg and fuji raw
> > > (.raf).
> > >
> > > I can see two rotate commands in digikam; Image > rotate, and Image >
> > > Correct exif orientation tag. I remember there was another method in
> > > v8, 'lossless jpeg transformation' but although I have the kipi plugin
> > > for that selected I don't see it in the menus in v9.
> > >
> > > What I want is to permanently rotate the image with no loss in image
> > > quality.
> >
> > Anything accessible from main window is lossless.
> >
> > Image -> Rotate is the kipi plugin. It works only for JPEGs, but it
> > rotates the actual image data. It works for any application that loads
> > the image. Image ->Correct exif orientation tag sets the exif info, like
> > some cameras do it when the orientation is set manually. The image data
> > is not changed, the image is rotated after loading. This just changes a
> > few bytes in the image, but needs to be supported by the loading
> > application.
>
> Hmm, 3 menu items to do the 'same' thing.  Sounds like the UI is too
> complicated.  How about
>
> 	o One rotate/flip menu.  Depending on mimetype digikam
> 	  decides which method to use as long as it's an lossless
> 	  operation.  Decision critria:  speed.
>
>         o when there's no lossless operation available inform the
> 	  user with an dialog with [] don't show this message again
>           for the filetype x/y
>
> If this makes sense for others too, I'll submit an wish list report
> in case it does not exists already ;)
>
> Achim

Marcel, Achim, 

The Rotate/Flip operations from kipi-plugins are also performed on non-JPEG 
files using ImageMagick command line. The jpeg format detection is performed 
by plugin.

In fact, these options are right to use with all image file formats.

Gilles