Sorry, hit the simple "reply" button...
---------- Forwarded message ----------
From: Marie-Noëlle Augendre <[email protected]>
Date: 2012/12/30
Subject: Re: [Darktable-users] Color Management gives dull photos with no
processing
To: Eckhart Pedersen <[email protected]>
By itself, the captor is not able to give you a 'neutral' rendering. From
what I understood, it gives a linear response to the light signal it
receives, and humans don't see in linear mode; so you 'need' some curve or
other to get a result that looks like what you've seen as the reality.
Marie-Noëlle
2012/12/30 Eckhart Pedersen <[email protected]>
> Thank you for your reply.
>
> I did indeed disable the base curve because I wanted a rendition as
> neutral as possible. I certainly mean no offense, but it appears to me
> that the architecture of darktable is wrong if it cannot produce natural
> colors with only an input and display profile and no further
> adjustments. Is this not the point of an input profile in the first
> place? Why would I need to mess with any curves? This seems really wrong
> to me, but I would be open to a good explanation.
>
> The reason I want to avoid messing with curves its that it cannot avoid
> to distort colors, no matter how close to "nothing" the curve is, this
> should not be required.
>
> Please help me understand this. The only thing in favor if your approach
> right now is that the Rawtherapee rendering is very similar to that off
> darktable, and yet it still appears wrong to me.
>
> I appreciate all the help you can get me.
>
> On 2012-12-30 21:54, Markus Jung wrote:
> > You must not disable basecurve, the images looks like if you did this.
> >
> > Sensors differ in the way how they respond to brightness, the basecurve
> > expresses how the sensor values have to be interpreted.
> >
> > Regards,
> > Markus
> >
> > Am 30.12.2012 22:08, schrieb Eckhart Pedersen:
> >> Hi all,
> >>
> >> I have tried very hard to understand color management for years, and I
> >> think I have finally understood the basics. I have now calibrated my
> >> Dell U2410 with an i1 display pro colorimeter + DispcalGUI, installied
> >> the profile system wide, and am now using this profile in darktable. I
> >> have even verified the calibration and profile using the colorimeter and
> >> everything seems to be ok.
> >>
> >> Calibration was done in standard mode of the display, 30 Brightness, 50
> >> contrast, and 6500K black body as whitepoint target.
> >>
> >> If I now load a raw image from my Canon EOS 5D II in darktable and
> >> disable all processing (except sharpening), I would expect to get a
> >> usable/neutral rendition of the photo on my display. However, the photos
> >> look very dull/muted. Since darktable comes with an existing input
> >> profile for the 5D II (it does, doesn't it?) I would expect the default
> >> look to look more or less natural, without having to fiddle with curves,
> >> saturation, or contrast in any way. But this does not seem to be true.
> >> It looks completely wrong.
> >>
> >> You can find an example image here.
> >>
> >> *raw* *CR2*: http://cornergraf.net/darktable.org/raw.CR2
> >> *exported JPG* with everything off, except sharpening:
> >> http://cornergraf.net/darktable.org/muted2.jpg
> >> *exported JPG* with black level +0.10, and exposure +1.3:
> >> http://cornergraf.net/darktable.org/proper2.jpg
> >>
> >> Please help me understand what is going on here. Is this the way the
> >> files should look like straight out of the camera and with no
> >> processing? Is my display calibrated or profiled incorrectly? What do
> >> you get when you look at the exported JPG files, which one looks more
> >> natural?
> >>
> >> I would greatly appreciate any help you can give me.
> >>
> >> Regards,
> >> Eckhart
> >>
> >>
> >>
> >>
> >>
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> >>
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> >>
> >
> >
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>
>
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--
<http://www.marie-noelle-augendre.com/photos/>
Mes dernières photos sont dans ma
galerie<http://www.marie-noelle-augendre.com/photos/>
.
Connaissez-vous Image Fixe <http://image-fixe.org>, le photo-club de Saint
Jean du Gard ?
Et parcourez les Cévennes à ma façon avec Cévennes
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--
<http://www.marie-noelle-augendre.com/photos/>
Mes dernières photos sont dans ma
galerie<http://www.marie-noelle-augendre.com/photos/>
.
Connaissez-vous Image Fixe <http://image-fixe.org>, le photo-club de Saint
Jean du Gard ?
Et parcourez les Cévennes à ma façon avec Cévennes
Plurielles<http://www.cevennes-plurielles.com/>,
------------------------------------------------------------------------------
Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS,
MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current
with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft
MVPs and experts. ON SALE this month only -- learn more at:
http://p.sf.net/sfu/learnmore_123012
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