[Digikam-users] A modern auto-fix?

[Gilles Caulier]

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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