Digital BW, The Print

* -----Original Message-----
* From: frankg_photo [mailto:fh.gross@sympatico.ca] 
* Sent: Sunday, November 16, 2003 8:29 AM
* To: DigitalBlackandWhiteThePrint@yahoogroups.com
* Subject: Re: [Digital BW] smoth transition of tones problem
* 
(snip earlier)
* > 
* =============================================
* 
* I need a little more explanation on this "you may not be getting a 
* perfectly linear response with the RGB separation curves in the tonal 
* range that is crucial to your sky. One way around this is to try a 
* different separation curve oruse two or more separation curve layers 
* with different curves and differentopacity (adding to 100%) so that 
* the effect of the curve is blended."

Frank,

For each printer there are a set or set of RGB separation curves created by
Paul or someone else to achieve different hues in the print. Some of these
curves give more linear results than another and some work better with one
particular printer. What can be done is to use two curves, say a Neutral and
a Warm, on separate curve adjustment layers and vary the opacity of the
layers 50/50, 60/40 or 70/30 or anything you want to make prints that have a
hue somewhere in between Neutral and Warm. This technique can also help if
one of the curves has a non-linear area in the tone ramp.
* 
* Are the adjustment curves I'm using to affect the contrast in the 
* image what you've called "RGB separation" curves ? Or, Paul's curves 
* that i apply at the end? 

Paul's workflow is a RGB separation curve method since it uses RGB curves to
partition the gray inks to print in separate tonal ranges. This technique is
used with Variable Mix and standard gray scale ink sets.

Martin Wesley
http://www.carolyn.cc/Guests/MartinWesley/pages/MW_01.html
http://www.borderless-photos.de/guests.html