What is the best way to rotate images?

[jc-21]

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.

Many thanks

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[Marcel Wiesweg]

> 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.

>
> Many thanks
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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
>
> >
> > Many thanks
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>
>

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[Gilles Caulier-2]

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
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[Markus Spring]

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Achim Bohnet schrieb:

> 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

This gets my full support.

To illustrate my background: My personal project "linux for silver surfers" ist
to help my 73years old father organizing his photos with digikam. He is still
astonished what can be accomplished with this excellent program, but the choice
of possibilites reachable through all the menus is sometimes overwhelming. So
every clarification I think will be usefull for all the non-cracks just trying
to work with the program.

Regards - Markus
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[jc-21]

Thanks for the replies. I decided to do some experiments on some  
unimportant images and the results are not what I expected.

The Image -> Rotate command reduces the file size. I tried on several pics  
with the same result. To give one example; a jpeg 2848x2136 pixels, size  
of file before rotate was 1.6MB (1,628,958), after rotating 1.5MB  
(1,562,298), pixel size remains the same.

In the lossless jpeg kipi plugin help file it says the file size should be  
bigger. Why is the file smaller if the tranformation is lossless.

The correct by altering exif data seemed to work fine.



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[jc-21]

Thanks for the replies. I decided to do some experiments on some
unimportant images and the results are not what I expected.

The Image -> Rotate command reduces the file size. I tried on several pics
with the same result. To give one example; a jpeg 2848x2136 pixels, size
of file before rotate was 1.6MB (1,628,958), after rotating 1.5MB
(1,562,298), pixel size remains the same.

In the lossless jpeg kipi plugin help file it says the file size should be
bigger. Why is the file smaller if the tranformation is lossless.

The correct by altering exif data seemed to work fine.

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