[Digikam-users] A modern auto-fix?

Tue May 27 15:52:13 BST 2014

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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