Datacolor User to User Support Group.

In a message dated 3/15/06 2:35:48 PM, ttrostel@... writes:


> > PFP does work best with Saturation or Perpetual intent with the
> Black Point
> > Compensation OFF.
> 
I may not have been specific enough: I wasn't recommending RelCol, only 
recommending that, if you use RelCol, you be sure to not use BPC with it.
> 
> Does the combination of black point compensation and Perceptual intent
> weaken the blacks considerably?
> 
I don't find that black varies with BPC with intents other than Colorimetric. 
With Colorimetric intents, unless you are emulating another output device 
(for instance, making a small proof to show a customer what they will get from 
your 7600, proofed on your 2200), you would probably want the darkest black 
possible, which would   mean unchecking Black Point Compensation. 

I don't quite understand why so many users are determined to use Black Point 
Compensation... it can't make blacks any darker than device black, but it can 
certainly make them weaker. With an ICC profile that already is attempting to 
map the darks as appropriately as possible, adding on a non-ICC hack at the 
last minute to remap the dark end is not a good idea.

C. David Tobie
Product Technology Manager
ColorVision Business Unit
Datacolor Inc.
CDTobie@...
www.colorvision.com