Datacolor User to User Support Group.

Now that I've read a lot more about color and color appearance it
seems that there really aren't any photographic print programs out on
the market that deliberately take illuminant into account.  Certainly
PhotoShop doesn't have anything even close to a setting for the
adaptation field light source.

Is that the arena of high end printing and publishing or does this
simply not exist.

Thanks

Tom

--- In colorvision_group@yahoogroups.com, CDTobie@... wrote:
 
> 
> Given that they are using ICC color management (which assumes D50, 2
degree 
> observer) how would they do that, beyond adding whitepoint transform
functions, 
> as monitor profiles used with Photoshop already do?
> 

A reverse transform from the D50 partialy adapted "source" state using
a  varient von Kries transform to a fully adapted space, then a
forward transform from that space to the target illuminant space.  For
the moment I'm going to ignore the surround effect and just go for
assuming a neutural background.

Its really not ICC management but adapting the picture to be viewed
correctly under a different illuminant.  I've almost finished my Java
source which can transform from one illuminant to another.  When its
done I can post some samples we can print out and evaluate.  If it
works well I can re-write in C++ and consider what to do with it :-)

Wish me luck!

--- In colorvision_group@yahoogroups.com, "Tom" <ttrostel@...> wrote:

I forgot to mention room lighting level cd/m^2 ambient is a big
component.  You can't measure simply color temperature.  It makes a
print which is highly specific to a particular viewing condition.

--- In colorvision_group@yahoogroups.com, CDTobie@... wrote:

> 
> You may want to read the whitepoint transform whitepaper on the
ColorVision 
> website...
> 

Where are the whitepapers?

--- In colorvision_group@yahoogroups.com, CDTobie@... wrote:

> 
> When I dig up a copy I'll send it to you...
> 

You are again too kind.

Thank you