[Digikam-users] digikam 4.2.0 : artefacts in previews

[Robert Zeller]

Gilles, thanks for the information. Unfortunately I have to downgrade to
DK 4.1.0 which did not have the problem. As you suggested I filed a
comment in

https://bugs.kde.org/show_bug.cgi?id=337231

Best regards,

Robert


On 08/08/2014 12:11 PM, Gilles Caulier wrote:
> Problem not reproducible here with your image.
>
> There is an option in Setup/Album View to switch preview in full or
> reduced size of image.
>
> Libjpeg provide a way to reduce image size at loading time. Screen
> resolution is used to estimate image size to load.
>
> See my screenshot here :
>
> https://www.flickr.com/photos/digikam/14835172186/
>
> Here option is disabled. So reduced image size is loaded. Compared to
> image editor on the right, image is smooth but do not have any
> artefacts has you describe.
>
> However, as i use WQHD flat screens, perhaps i'm not on the right
> context to validate.
>
> With 4.2.0 release we have introduced a new code to handle HQ screen
> resolution has retina display from Apple. Entry in bugzilla is this
> one :
>
> https://bugs.kde.org/show_bug.cgi?id=337231
>
> I check this code under Linux, OSX and Windows with different screen
> sizes, and all work fine.
>
> Perhaps screensize returned by your system is wrong.
>
> I recommend to post a comment in this bugzilla file to have feedback
> from original contributor and start investigations...
>
> In all cases, the turn over on your system is to turn on option in
> setup panel for the moment.
>
> Note : you are not alone with this problem. See this comment :
>
> https://www.digikam.org/node/715#comment-20800
>
> Best
>
> Gilles Caulier
>
> 2014-08-06 14:17 GMT+02:00 Robert Zeller <robert.zeller at robert-zeller.org>:
>> Gilles,
>>
>> one more information on this issue:
>> my jpgs are 36 Mpx big. To show the entire photo on my screen a zoom
>> factor of 18% is used. If I zoom in to 50% or 100% the artifacts
>> disappear. To me it looks like the problem is caused by the algorithm
>> that reduces the picture view size to the screen size. I still have a
>> copy of DK 4.1.0 which does not show this misbehavior. Something must
>> have been changed between the two versions. Using Gimp I don't get any
>> artifacts, however the Gnome Image viewer eog also produces the same
>> kind of artifacts as DK 4.2.0.
>>
>> I came across one other issue in DK 4.2: When using : settings -->
>> configure and switching between the different items in the configure
>> menu, DK responses become extremely slow, and DK is using a lot of CPU
>> power and it is not possible to cancel the configure window. What is the
>> guy doing?
>>
>> Best regards,
>>
>> Robert
>>
>>
>> On 08/06/2014 08:42 AM, Robert Zeller wrote:
>>> Gilles,
>>>
>>> the files are too big to be sent by email. Please download the
>>> screenshot and the original jpg from my web page:
>>>
>>> screenshot: www.robert-zeller.org/transfer/DK-4.2.0-artifact-shot.jpg
>>> (see the strange pattern in the dome of the mosque and the poor resolution)
>>>
>>> original: www.robert-zeller.org/transfer/0012-SR-2014_05_06_170343.jpg
>>> (file is about 15 MB)
>>>
>>> I don't see this behavior in previous versions of DK
>>>
>>> Best regards,
>>>
>>> Robert
>>>
>>>
>>>
>>> On 08/06/2014 12:06 AM, Gilles Caulier wrote:
>>>> Can you take a shot and share a screenshot ?
>>>>
>>>> Problem is not visible here.
>>>>
>>>> Also, share some files to test here...
>>>>
>>>> Gilles Caulier
>>>>
>>>> 2014-08-06 0:00 GMT+02:00 Robert Zeller <robert.zeller at robert-zeller.org>:
>>>>> Hello,
>>>>>
>>>>> I just compiled DK 4.2.0 on openSUSE 13.1 . There were no compilation
>>>>> problems.
>>>>> BUT: as compared to DK 4.1.0 I see on some photos a relatively strong
>>>>> artifact (moirée) on regular structures. Also I have the impression that
>>>>> the pictures are not loaded in full resolution. These artifacts seem to
>>>>> disappear when using the image editor. Is there a way to remove the
>>>>> moiree patterns? or to force DK to load pictures in full resolution?
>>>>> Best regards,
>>>>>
>>>>> Robert
>>>>>
>>>>> _______________________________________________
>>>>> Digikam-users mailing list
>>>>> Digikam-users at kde.org
>>>>> https://mail.kde.org/mailman/listinfo/digikam-users
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