[Digikam-users] A modern auto-fix?

Tue May 27 18:01:01 BST 2014

Interresting. thanks for the link. I will plan to give this job later
to a new student...

Gilles Caulier

2014-05-27 16:52 GMT+02:00 Milan Knížek <knizek.confy at gmail.com>:
> Hi Gilles,
>
> in addition to the Local Contrast tool, it would be nice to have an
> equivalent of "Shadows and Highlights" tool which darktable has:
>
> http://www.darktable.org/2012/02/shadow-recovery-revisited/
>
> I can use darktable also with non-raw images, but I find digikam's Image
> Editor naturally better integrated with the digital photo management
> tool of my choice ;-)
>
> cheers!
> Milan
> --
> http://milan-knizek.net/
> About linux and photography (Czech only)
> O linuxu a fotografování
>
>
> Gilles Caulier píše v So 17. 05. 2014 v 14:52 +0200:
>> 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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