Datacolor User to User Support Group.

In a message dated 9/10/08 12:06:18 PM, rickbehl@... writes:


> My only concern is that if more areas are showing out of gamut with
> the new Spyder profile does that mean these areas cannot completely
> correctly be put onto the paper using the current printer and ink ?
> 
You are correct in understanding that color truely out of the printer's range 
need to be brought "in gamut' one way or another to be printed, and won't be 
literal representations of the color in question. This is more clear for 
saturated colors beyond the range of your inks on your paper. For dark colors, its 
a matter of blends that can be dark enough, while still being saturated 
enough, to avoid dark areas being weak or dull.
> 
> My understanding was that for the areas that are showing as out of
> gamut then there is some 'black box' calculation occurring which means
> that the colours you eventually get in these areas are close
> 'approximations' to the desired colours but the result will be not
> entirely predictable.... Am I right in thinking this ?
> 
The problem is that Photoshop's   "black box" for determining what is an out 
of gamut color does not necessarily mesh with the profile's method of doing 
things. For the deep colors in particular, Adobe may be using perceptual 
stretching or black point compensation assumptions. This means that a non-Datacolor 
printer profile "prestretched" for black point compensation may appear to have 
a larger gamut in the dark areas, when it fact it's gamut is no larger, or 
perhaps even smaller, than that of the Datacolor profile, even though the gamut 
warning says differently. One of several reasons to take the gamut warning with 
a grain of salt...

C. David Tobie
WW Product Technology Manager
Digital Imaging & Home Theater
Datacolor
CDTobie@...
www.datacolor.com/Spyder3



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