[digiKam-users] Blurry photos with 7.3 and 7.6

[Maik Qualmann]

As the conversation continued here in private, the explanation.
Sony RAW files can have a fairly small embedded preview.
Here 1920x1080 to 6024x4024, plus a different aspect ratio of 16:9 to 3:2.
Since we scale the preview to the same optical size, there is a strong loss of sharpness.
We added the ability to preview the full RAW image in digiKam-8.0.0, high quality but slower.

https://invent.kde.org/graphics/digikam/-/commit/c2b2efe2c9265003f56276d26756745c4955a164[1]

Maik

Am Montag, 23. Mai 2022, 18:28:18 CEST schrieb p b:
> Thanks Mark for your help.  I just sent you an email directly to you with a
> few images.
> 
> ________________________________
> From: Digikam-users <digikam-users-bounces at kde.org> on behalf of Maik
> Qualmann <metzpinguin at gmail.com> Sent: May 23, 2022 6:34 AM
> To: digiKam - Home Manage your photographs as a professional with the power
> of open source <digikam-users at kde.org> Subject: Re: [digiKam-users] Blurry
> photos with 7.3 and 7.6
> 
> I did a test here with my existing ARW files. The preview of the embedded
> jpeg is blurry, that's for sure. With half the RAW preview, I don't really
> see any loss of sharpness. Maybe you should upload a sample image or email
> it to me. Are you using a 4K desktop resolution?
> 
> Maik
> 
> Am Montag, 23. Mai 2022, 06:28:01 CEST schrieben Sie:
> > The problem is known with certain Sony RAW files. The embedded Jpeg is
> > very
> > small for these images. The only way currently is to enable  half RAW
> > preview. Of course, this is also a reduction compared to the full view in
> > the editor and zooming in is not really suitable. Otherwise we would have
> > to create the possibility to add the full RAW decoding in the preview as
> > well, but that would also make the preview much slower.
> > With other camera models (e.g. Nikon) the problem does not occur, the
> > embedded preview Jpeg has the full size.
> > 
> > Maik
> > 
> > Am Montag, 23. Mai 2022, 01:47:01 CEST schrieb p b:
> > > I am not sure why but images on my digikam have become blurry.  Using
> > > Windows 10.  First noticed when I updated to 7.6.  Went back to 7.3 and
> > > still have same problem.  Didn't notice this prior to the initial
> > > upgrade
> > > to 7.6.  Tried building new thumbnails.  Tried using ½ size raw files as
> > > well as the embedded jpeg.  Same issue.  These are on Sony Raw “ARW”
> > > files.
> > > 
> > > I've attached screenshots of one image.  Once with the image editor
> > > (which
> > > is sharper) and one with just double clicking on the image in Digikam.
> > > I'm
> > > not sure how obvious it is in the screenshot but it's obvious on my
> > > monitor.  In the double click, it looks like the photos have no point of
> > > focus.
> > > 
> > > Let me know what I can do.  Thank you for your help.



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[1] https://invent.kde.org/graphics/digikam/-/commit/c2b2efe2c9265003f56276d26756745c4955a164
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