Dimensions of processed RAW (Panasonic RW2) incorrect

[Jens Benecke-2]

Hello,

I am using Digikam 4.14 on Ubunt 14.04 LTS. (I plan on upgrading to 5.0
as soon as it is available on a LTS Ubuntu version.)
I have many RW2 files taken on my Panasonic Lumix LX3, exported from
iPhoto (but the images are unmodified).
There is also an exported processed (edited) JPG from iPhoto which shows
the same image.

exiftool reports both RW2 and JPG dimensions as "3776x2520" (Image Size).
But when I import both into Digikam the dimensions of the RW2 file are
shown as "3792x2538".

Any idea why?
This is important since my iPhoto exporter also writes XMP sidecars with
face rectangle data which are shifted when Digikam applies them to the
RW2 file.

Thanks!

Jens
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[Gilles Caulier-4]

Hi

Don't forget that RAW image is non processes sensor data. The final image size exported to JPEG can be a cropped version.

In all cases, this si done by libraw. If it's a bug, check before the version of library used by digiKam.

Another point : the image size given in image editor is show using image metadata. Here Exiv2 is used. In metadata there are multiple place where image size can be taken : Exif, Makernaotes, XMP. Exif is always used in priority, but In Exif there are also few different place where info can be taken, and sometime, the value can be différents (yes, it's not homogeneous). And i don't talk about makernotes, where info is not documented by camera maker.

To resume, i'm not top surprised by this little difference. If it's a bug in libraw, report to libraw team. If it's a bug with metadata, an exception must be add to digiKam metadata parser about RW2.

To tes with libraw, there are few CLI tools available as option packages to decode on RAW command line (ad dcraw do). 

To test with Exiv2, just use CLI tool from library.

Gilles Caulier

2016-01-25 21:38 GMT+01:00 Jens Benecke <[hidden email]>:

Hello,

I am using Digikam 4.14 on Ubunt 14.04 LTS. (I plan on upgrading to 5.0 as soon as it is available on a LTS Ubuntu version.)
I have many RW2 files taken on my Panasonic Lumix LX3, exported from iPhoto (but the images are unmodified).
There is also an exported processed (edited) JPG from iPhoto which shows the same image.

exiftool reports both RW2 and JPG dimensions as "3776x2520" (Image Size).
But when I import both into Digikam the dimensions of the RW2 file are shown as "3792x2538".

Any idea why?
This is important since my iPhoto exporter also writes XMP sidecars with face rectangle data which are shifted when Digikam applies them to the RW2 file.

Thanks!

Jens
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Digikam-users mailing list
[hidden email]
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[Huntington-Beratung]

Hello,

perhaps the difference is caused by correction of the lens distorsion,
which can be configured in the camera menu.
Distorsion corrected image are normally cropped by the algorithm.

Jürgen

Am 25.01.2016 um 21:38 schrieb Jens Benecke:

> Hello,
>
> I am using Digikam 4.14 on Ubunt 14.04 LTS. (I plan on upgrading to
> 5.0 as soon as it is available on a LTS Ubuntu version.)
> I have many RW2 files taken on my Panasonic Lumix LX3, exported from
> iPhoto (but the images are unmodified).
> There is also an exported processed (edited) JPG from iPhoto which
> shows the same image.
>
> exiftool reports both RW2 and JPG dimensions as "3776x2520" (Image Size).
> But when I import both into Digikam the dimensions of the RW2 file are
> shown as "3792x2538".
>
> Any idea why?
> This is important since my iPhoto exporter also writes XMP sidecars
> with face rectangle data which are shifted when Digikam applies them
> to the RW2 file.
>
> Thanks!
>
> Jens
> _______________________________________________
> Digikam-users mailing list
> [hidden email]
> https://mail.kde.org/mailman/listinfo/digikam-users

--
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