[Digikam-devel] [digikam] [Bug 279544] Tag image for unsharp pictures
axel.krebs at t-online.de
Sat Aug 24 15:12:00 BST 2013
--- Comment #9 from Axel Krebs <axel.krebs at t-online.de> ---
Am 24.08.2013 13:44, schrieb Gowtham Ashok:
> --- Comment #7 from Gowtham Ashok <gwty93 at gmail.com> ---
> Hello Axel,
> Thanks for the links. Gilles, Marcel and me are working on adding this feature
> to digiKam.
> For more information, please refer to
My original intention reffered on blur- which comes more and more
NIKON advices certain techniques to reduce bluring effects see
for its Model D800 / D800 E.
(I own one- great machine, 36 MPixels ;-)! )
>From my fotographical practise, I experienced, that blur can be an
interesting effect. But, most of the time, we want or even need to avoid
this unsharpness type!
When having _real_ fotographic situations in mind, I feel, that _linear_
transitions ("mistakes, unsharpness effects") are _not_ the single
There can be circular or bow-shaped transitions or others. Imagine, a
photographer stands in the wind and get hit by a gust of wind. Not
having a tripod because of weight limitations.
The movement of an imaginary pics point will then _not_ follow a line
nor a circle but rather more a _freely_ curved line.
Another type of mistake maybe related to the artefacts/mistakes, you
mentioned in your descriptive
What happens, if some parts of a pic are too bright by far? Maybe there
is a way to reconstruct the brightness distribution around such a
brigthish area using neural network approaches for self learning
procedures, how "burned-out" areas can be filled according to surronding
areas? And still keep similar appearences compared to the surrounding areas?
I mention this idea to show, that I guess, the borderline between
filtering for quality and impoving is not a fixed line at all but needs
interpretation. Maybe numerical interpretation?
Besides, some number characteristics could help to concentrate on such
pics which are worth for improving techniques or- not.
Some further thoughts-
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