[Digikam-users] Odp: [OT] Color Management Profiling

[Paul Waldo]

Thanks for the reply, Piotr.  I think I will contact the profiling service you 
mentioned.  They seem to be far and away the least expensive.

The problem with only using one profile (as I understand it) is that different 
white balance settings alter color's relationships differently.  For example 
(and purely hypothetically), a Sunny WB might depress the red, a Cloudy WB 
might accentuate the red, and the Auto WB might only slightly accentuate the 
red *and* depress the blue.  If this is the case, accurate color rendition of 
the RAW file would require a profile for each...

Paul

On Thursday 03 January 2008 5:04:10 pm Piotr Tarnowski wrote:
> Paul,
>
> for me it is not common to profile DSLR but if you would like you
> probably should profile RAW image using best light source possible
> (north window sun?)
> White balance should be applied on image with applied profile so camera
> white balancing is not a case.
>
> In theory you need printer profile for any combination of
> paper/ink/GuttenPrint settings,(I have one for my best settings and use
> it for draft as well).
> You can do profile by printing downloaded pattern, sending this printout
> to someone who can measure profile and downloading your profile. Often
> you can check results before you pay by downloading your sample photo
> converted by ICC provieder. One profile costs c.a. $40 + 1 or 2 A4 pages
> of print.
> Some more details about preparing printer for profiling here:
> http://www.blackfiveservices.co.uk/profiling.shtml
>
> Hope this will help, even if OT :)
> Piotr Tarnowski
>
> Dnia 3-01-2008 o godz. 19:29 Paul Waldo napisał(a):
> > Hi all,
> >
> > Hopefully this is not too off-topic...
> >
> > I have vowed to get Color Management into my workflow, but I am having
> > some conceptual issues.  Hopefully someone can right me ... :-)
> >
> > I have a Canon Digital Rebel camera and have purchased an IT 8.7/2
> > target.  My plan is to photograph the target and create a profile for
> > the camera using lprof.  That got me to thinking about White Balance
> > settings and how they relate to a profile.  It seems to me that target
> > and profile are only accurate for some specific lighting setup.  If this
> > is so, and if I understand CM correctly, it makes for some disturbing
> > implications:
> >
> >     * I need a specific profile for each WB setting (sunny, cloudy,
> >       incandescent, etc.)
> >     * I need to capture the target once for each WB setting, and the
> >       lighting has to match WB (eg. must wait for a cloud to pass over
> >       before snapping that Cloudy WB target pic)
> >     * Camera, Manual and Auto WB cannot have a profile, because software
> >       (on the computer or camera) dynamically adjusts the WB in
> >       unpredictable ways.
> >     * When taking a photo, I must manually set the WB and then use the
> >       correct profile when converting it.
> >     * As a scene deviates from the ideal for a given WB setting, the
> >       conversion will become less accurate.  For example an outdoor
> >       scene that is bright and sunny, except for the cloud that is
> >       casting a shadow over the main subject.  Neither Sunny, Cloudy nor
> >       Shadow WB settings would be totally approriate.
> >
> > Somebody please tell me I have a fundamental flaw in my logic!  If not
> > this becomes quite a cumbersome system to use!
> >
> >
> >
> > So now that I have the input device problems off my chest, we come to
> > the output device, an Epson Stylus Photo Pro 1280.  I need a profile for
> > this printer, but I don't know where to get one.  Epson provides ICC
> > profiles for this printer *when printing with ColorLife paper*.  There
> > is no profile for any other type of paper, such as Matte Heavyweight.
> > It is my guess that, even if Epson did provide profiles, they would not
> > be accurate because they would be created using their Windows driver.  I
> > use Kubuntu Linux and gimp-print.
> >
> > So, the questions are:
> >
> >     * Is there a printer profile for my setup
> >     * If there is not, is this a weak enough link in the chain that
> >       going through the trouble of profiling all of my other devices is
> >       not worth it?
> >
> >
> > Thanks in advance for any info you can provide!
> >
> > Paul
> > _______________________________________________
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> > Digikam-users at kde.org
> > https://mail.kde.org/mailman/listinfo/digikam-users
>
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