Bug 160846 - blurred preview of pics
Summary: blurred preview of pics
Status: RESOLVED WORKSFORME
Alias: None
Product: digikam
Classification: Applications
Component: Preview-Image (show other bugs)
Version: 0.9.3
Platform: Debian testing Linux
: NOR normal
Target Milestone: ---
Assignee: Digikam Developers
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2008-04-15 02:22 UTC by Siegfrid Brandstätter
Modified: 2012-08-09 07:36 UTC (History)
0 users

See Also:
Latest Commit:
Version Fixed In: 0.9.4


Attachments
Screenshot (756.76 KB, image/png)
2008-04-15 22:11 UTC, Ingo Kasten
Details
left digikam preview,right window Editor opend with F4 (853.88 KB, image/jpeg)
2008-04-15 23:44 UTC, Siegfrid Brandstätter
Details

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Description Siegfrid Brandstätter 2008-04-15 02:22:08 UTC
Version:           0.9.3 (using KDE 3.5.9)
Installed from:    Debian testing/unstable Packages
OS:                Irix

The pictures are blurred in the preview, also after selecting a picture and opening it. If pressing on "Picture" and "F4" or make a Slideshow the Pics are sharply. It's a problem of digikam 0.9.X in 0.8.3 it isn't.
Comment 1 Siegfrid Brandstätter 2008-04-15 02:36:33 UTC
There is a error in "OS" isn't IRIX is a Debian Lenny
Comment 2 Arnd Baecker 2008-04-15 10:50:20 UTC
Siegfried, is this the same problem as discussed  at the end of 
https://bugs.kde.org/show_bug.cgi?id=148649 ?
Comment 3 caulier.gilles 2008-04-15 11:13:13 UTC
Arnd,

After to remove all ~./thumbnails folder, i cannot reproduce the problem here. And you ?

Gilles Caulier
Comment 4 Siegfrid Brandstätter 2008-04-15 12:48:11 UTC
Hallo Arnd, 
I think it is not the same,
https://bugs.kde.org/show_bug.cgi?id=148649 ?

Hallo Gilles,
after removed all  ~./thumbnails the problem does persist.
Comment 5 Ingo Kasten 2008-04-15 15:03:46 UTC
I can confirm the above behavior in digikam 0.9.2 / debian-etch / KDE 3.5.5.
(digikam 0.9.2 compiled from source).

Ingo Kasten
Comment 6 Arnd Baecker 2008-04-15 18:30:43 UTC
Hmm, I don't see any problems  ;-) - could you maybe  attach a screenshot?
Comment 7 Ingo Kasten 2008-04-15 22:11:59 UTC
Created attachment 24346 [details]
Screenshot

On the attached screenshot you can see a snapshot of a wall-
on the left digikam preview, enlarged to about the size
of the right window, which shows the "edit" window of 
the same picture.

Ingo
Comment 8 caulier.gilles 2008-04-15 22:39:37 UTC
Segfrid, 

You talking about preview mode, not thumbnails from icon view

Preview load a reduced version of image, not the full image to speed up process.

Image Editor load the full image. This is why you see a difference. Preview != Editor

Arnd, for me this file is invalid

Gilles Caulier

Comment 9 Siegfrid Brandstätter 2008-04-15 23:44:17 UTC
Created attachment 24350 [details]
left digikam preview,right window Editor opend with F4

On the left Window the preview on the same size like the right window is opend
with F4 and 120% enlarged.
Gilles, your argument for Preview != Editor difference, (for speed up process).

In digikam 0.8.x in Debian Etch the problem does not exist, tell me why?
Comment 10 Ingo Kasten 2008-04-15 23:51:48 UTC
Gilles,

the explanation you give is understandable to me (speeding up the processes).
So maybe it is not a bug. On the other hand it would be a wish to me that there
was the choice of setting up the resolution of the preview picture, as I
use digikam for watching my pictures, too, and the easiest way of doing so
is to watch them in the preview mode.

Regards
Ingo
Comment 11 caulier.gilles 2008-04-16 00:00:24 UTC
To Siegfrid #9:

> In digikam 0.8.x in Debian Etch the problem does not exist, tell me why? 

==> there is no preview mode in 0.8.0, only editor as current 0.9.x

editor is a separate window. preview is always embedded in album gui.

Gilles Caulier
Comment 12 caulier.gilles 2008-04-16 00:05:12 UTC
To Ingo #10 :

Preview is for naviguate speedly between the image to make a selection, review, etc. We don't need real data here. Loading speed is important to toggle between image shortly.

With JPEG, we use reduced loading method from libjpeg
With RAW file, we use JPEG preview embeded in RAW data (reduced image used to display RAW pictures by camera to a TV)
With PNG and TIFF, the JPEG preview embeded in IPTC metadata (800x600)

Editor is to edit the picture. we need real image data here. Loading huge picture take a while (for ex. with RAW files)

Gilles Caulier
Comment 13 Arnd Baecker 2008-04-16 06:48:31 UTC
Siegried, Ingo,

have you tried to enable "Embedded preview load full image size"
under Digikam "Settings"/"Configure Digikam"/"Albums" ?

Best, Arnd
Comment 14 Ingo Kasten 2008-04-16 20:41:18 UTC
Arnd,

Great! That's it!
Sorry for all the trouble & thank you very much!

Ingo
Comment 15 Arnd Baecker 2008-04-16 20:49:40 UTC
Ingo, 

great! (and no problem ... ;-)

Is there anything which could be done, to avoid this type of problem?
(maybe something like this wish,
expressed for the light-table, 
https://bugs.kde.org/show_bug.cgi?id=146260 
would be the optimal solution ....)

A text for a FAQ entry would be another option...

Best, Arnd
Comment 16 Ingo Kasten 2008-04-16 21:19:40 UTC
Arnd,

For me, it's o.k. now.
Maybe the setting "Embedded preview load full image size"  should be the default one.
I use Digikam as a general-purpose-photo-application, that means I also watch my photos, choosing the folder, clicking on the first thumbnail, enlarge it to full size and then watch the pictures by pressing pg-up or pg-down. Formerly I was very dissappointed about the quality of my camera, after choosing the right option I now know it better... ;-)
On my computer (which isn't the fastest - Sempron64-3000, 1.5 GB memory)
the (enlarged!) pictures load in less than 1 sec. I guess that most KDE4 users will have better computers...
Up to now I don't use the light-table very often, so I should not give any comment...but the proposal given in https://bugs.kde.org/show_bug.cgi?id=146260 might also be useful.

Thanks,again
Ingo 
Comment 17 Siegfrid Brandstätter 2008-04-16 23:32:11 UTC
Oh yes this wasn't enabled , now it's ok for me also. Thank's for your time and sorry. I dont use the lighttable.
Comment 18 Siegfrid Brandstätter 2008-04-16 23:39:50 UTC
Enable "Embedded preview load full image size" fix the problem.
Thank you.