Re: [CinePaint] Tutorial for photographers / printers

[Kai-Uwe B. <ku...@gm...>]

Frank,

the Ufraw curves are indeed the reason to include it in the tutorial.
Can you send me the mentioned tone curves for testing.

DCraw has the -p option included. What I find is difficult, it targets 
simply to sRGB, which indeed is fine for web graphics. As well this is 
quite reasonable and fast for ppm output as there is no option to embedd a 
profile.
But many cameras can see more gamut than sRGB. So to dont convert to sRGB 
eighter with the -p or -m option seems a good idea for me. Ok, thats 
simply about preserving quality not about speed or a dedicated workflow.

A further step with the rawphoto plug-in would be to set up a database 
which knows devices and corresponding ICC profiles. These should then 
automaticaly been embedded on camera identification during loadtime. But 
a few other things I like to do first. So it maybe takes some time.

The tutorial contains no explanatory link. The links you provide are 
interessting too. 
Just, I have only a small collection of them, with the emphasise of the 
Linux operating system.

regards
Kai-Uwe Behrmann
                                + development for color management 
                                + imaging / panoramas
                                + email: ku...@gm...
                                + http://www.behrmann.name



Am 10.07.05, 12:25 -0400 schrieb Frank Peters:

> On Sun, 10 Jul 2005 15:07:44 +0200 (CEST)
> Kai-Uwe Behrmann <ku...@gm...> wrote:
> 
> > You will find the tutorial under Tutorial::Photography in the left hand 
> > CinePaint menu on my website. See the link below.
> > 
> > Hope you find this sometimes difficult matter good to understand.
> > Comments are as allways welcome.
> > 
> 
> Color management is a difficult subject to express in only a few
> paragraphs, but I think that you've covered the essentials in a
> fairly complete manner, especially those regarding the manipulations
> within Cinepaint.  However, any discussion should always include
> references for further research and study.  Because you
> have listed none, I offer these links to Cinepaint users:
> 
> http://www.boscarol.com/pages/cms_eng/index.html
> 
> http://www.color.org/whycolormanagement.pdf
> 
> http://www.drycreekphoto.com/Learn/color_management.htm
> 
> http://www.av8n.com/imaging/color-management.htm
> 
> http://www.csse.uwa.edu.au/~robyn/Visioncourse/colour/lecture/
> 
> Also, the tutorial, which is supposed to be about Cinepaint, tends
> to over emphasize the Ufraw software.  Ufraw is a fine package,
> but Cinepaint can do everything with, as you suggest, the possibility
> of far more control.  The only drawback that may concern digital
> photographers is the absence of Ufraw tone curves in the Cinepaint
> (i.e. Gimp) format.  Sometimes these curves can be very convenient
> for correcting image imbalances.  To make Cinepaint more attractive
> to digital photographers, a suite of tone curves should be available
> in the proper format.  (I have converted a few Ufraw and other curves
> to Gimp format.  If anyone would like a copy of these curves just post
> a message to the list.)
> 
> The dcraw conversion program is, of course, indispensable, but there
> is a feature (undocumented?) of dcraw that is not utilized by Cinepaint.
> Dcraw has the ability to directly apply color profiles following the RAW
> conversion, but it must be specially compiled with the -DUSE_LCMS option.
> For my own personal use I have modified the Cinepaint rawphoto plugin to
> incorporate this feature.  Now, I can open my RAW files into Cinepaint
> with the color correction automatically applied without using the color
> management tools of Cinepaint itself.  Because my images are used
> only for web display (i.e. no prints), this method can be very quick
> and handy.
> 
> Anyway, thanks for a nice tutorial on a very difficult subject.
> 
> Frank Peters
>