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

[Piotr Tarnowski]

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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