Re: Profiling black & white printing
Re: Profiling black & white printing
- Subject: Re: Profiling black & white printing
- From: Ernst Dinkla <email@hidden>
- Date: Mon, 16 May 2005 12:22:37 +0200
Marco Ugolini wrote:
In a message dated Sat, 14 May 2005 20:46:30, CDTobie wrote
The B&W mode is not profilable, its a fixed setting mode. The only
adjustments are a choice of density settings, and a hue adjustment control.
I understand that these are the controls available within the new driver.
But what I am after is a methodology to ensure that all tonalities in
grayscale come out looking exactly as they ought to according to what
appears on a calibrated and profiled display in Photoshop.
Can such a methodology be derived from ICC profiling for 4-color process?
Does color management in any way apply to the printing of grayscale images
using black-only inks? If so, how?
Or is the hard way, through trial and error, the only methodology possible
instead? (Output a value to print, measure its L*, adjust, output again,
measure again, etc.)
One added difficulty is that the visual appearance of grayscale values can
be made to translate to L* values under several different scenarios, with
changing results.
So, for example, if you enter a 15% value in a grayscale file in Photoshop,
it translates to an L* of 87 (in RelCol) if the grayscale file has a gamma
of 2.2, but the L* goes up to 89 in gamma 1.8. So, how does one produce a
print that precisely reflects the L* values corresponding to what one sees
in the grayscale file on the monitor, in whatever gamma environment?
Please forgive any confusion I may be showing on this subject. Black & white
is dear to my ex-darkroom-printer's heart, and I am trying to understand how
Epson's UltraChrome K3 inks are changing the approach to it.
Thank you.
--------------
Marco Ugolini
Mill Valley, CA
If Epson's driver doesn't deliver it and the RIPs get it after a year
then take a look at QTR a shareware RIP for B&W printing that can drive
the existing Ultrachrome printers in B&W mode + color toning. It can
also drive quad inksets. Without doubt it will have its drivers ready
for the new models in a few months after they are delivered.
Its workflow uses amputated ICC profiles for matte and gloss B&W prints
+ a B&W Lab "space". So a perceptual distribution of the greys on top of
the linearisation of the inksets.
www.harrington.com
at the bottom of the page.
Mac OS X, Windows, Linux
And Ergosoft most likely has its drivers already I guess, they had a
driver for a similar Roland printer.
Ernst
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