[Digikam-users] A modern auto-fix?

Sat May 17 13:55:19 BST 2014

The digiKam documention is pretty old now...

Documentation must/can be a non developer task for an open source
project as digiKam.

Typically, about Local Contrast tool, a documentation section can be
written using original LDR ToneMapper notice.

If some people who write well in english is interrested to help the
project in this way, i can give some guidances here. Writting handbook
using Docbook format is not too diffciult after all (a lot lesser than
writting code (:=)))

Gilles Caulier

2014-05-17 14:52 GMT+02:00 Gilles Caulier <caulier.gilles at gmail.com>:
> Look in digiKam source code where all info can be found :
>
>  * This file is a part of digiKam project
>  * http://www.digikam.org
>  *
>  * Date        : 2009-08-09
>  * Description : Enhance image with local contrasts (as human eye does).
>  *               LDR ToneMapper
> <http://zynaddsubfx.sourceforge.net/other/tonemapping>
>
> Documentation is at this Url. When i ported this tool to digiKam, i
> fixed memory leak, optimized code (now multicore), and add 16 bits
> color depth support...
>
> This is my prefered photo fix tool. I use it everyday, esepcially with JPEG.
>
> Gilles Caulier
>
>
> 2014-05-17 14:30 GMT+02:00 Paul Verizzo <paulv at paulv.net>:
>> It's Windows, Carl, and the processor is a P.O.S. dual core that was meant
>> for a laptop, but it's in my desktop.  My comment on speed was relative to
>> the Canon program, and even the Windows Phone one.  But it's fine, it is
>> what it is, I'm just grateful for the discovery.
>>
>> On the topic, and further internet research, that the use of "Local
>> Contrast" in dK might be a bit of a misnomer.  As mentioned, in PS, the
>> plug-in does work with local contrast, not overall tones.  In fact, I'm
>> seeing "Tone mapping" being used for what dK calls "Local Contrast."  Seems
>> to be more accurate, grammatically.
>>
>> Paul Verizzo
>>
>> On 5/17/2014 8:22 AM, Carl McGrath wrote:
>>
>> Paul
>> I scanned quickly for what OS you are running but did not find it; I run
>> openSUSE 13.1
>> dK 4.0.0 arrived a few days ago, with all the fixes Gilles reported that
>> enable multicore.
>>
>> Local Contrast and Sharpness tools now blazing fast(by comparison)
>>
>> On 05/17/2014 07:58 AM, Paul Verizzo wrote:
>>
>> Wow, that's it!
>>
>> I finally had time to locate some of the lousy original photos I had
>> successfully improved with a couple of other programs, including, oddly,
>> that Nokia (Windows Phone) Fix.
>>
>> Putzed with dK Local Contrast, works beautifully.  Just what I was after.
>>
>> I tried to find information and help in the dK PDF, but could not.
>> Searching online, "local contrast" brings up a lot of Photoslop entries, but
>> they necessitate using layers and unsharp mask.  So much for the expensive
>> program.  If I add "digikam" to the search, I just keep getting repeats from
>> a blog posting.
>>
>> I'd like to learn how to manually control adjustments for best results.
>>
>> Any further help to be found?
>>
>> Oh, yes.  Kind of slow, but if I factor in the need to open another program,
>> rename, shuffle files, Local Contrast is another dK winner!
>>
>> Thanks, Giles (and all others!)
>>
>> Paul
>> On 5/10/2014 12:11 PM, Gilles Caulier wrote:
>>
>> digiKam has LocalContrast tool which make the same correction to
>> image. In fact it emulate pseudo HDR rendering.
>>
>> Gilles Caulier
>>
>> 2014-05-10 18:07 GMT+02:00 Paul Verizzo <paulv at paulv.net>:
>>
>> Background:  I've been in digital photography since 2000, decades of film
>> before and since.  I'm certainly familiar with the use of curves to correct
>> bad photos.  But so tedious, and if the photos are snapshots, hard to
>> justify the time.  It appears to me, although I can't prove it, that digital
>> cameras, discrete or within phones, seem to be doing a much better job
>> automatically adjusting curves than my old Minolta A2, for instance.
>>
>> I recently became aware of a new free Canon program, My Image Garden, that
>> has a much improved Auto-fix than its forerunner.  As an example, a backlit
>> photo processed in MIG will bring up only the shadows while leaving the
>> normal and highlights alone.  It allegedly uses a zone by zone analysis.  It
>> is a terrible program in every other regard, clunky interface, bloated, etc.
>> But I used it for some recent pics to advantage.
>>
>> Some of those pictures were originally on my Windows Phone 8, which I had
>> copied to the HD.  Before I deleted them from the phone, I poked around with
>> the options at that point.  I found an auto-fix, pushed the "button," and my
>> jaw dropped.  Literally.  A very dark, underexposed shot made perfect!  This
>> feature is within the Nokia programs!  It is so good, I can see myself
>> transferring photos from other sources into the phone for correction!  And
>> it's fast, even so.
>>
>> I went back through the digiKam manual and looked on screen, and I see the
>> old standbys there, but nothing like what I've experienced with the above.
>> Oh, upon lots of research, I found a 2007 $40 program called Photoright that
>> upon test, seems to be doing similar zone adjustments.
>>
>> Bottom lines:  Are my observations valid?  Do you think DK might get
>> something like this?  Oh, yes, all Windows although MIG is available for
>> Mac.
>>
>> Thanks, Paul Verizzo
>>
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