Digital BW, The Print

Ernst Dinkla wrote:
> Carl Schofield wrote:
> 
> 
>>So are you saying that there is a way to create standard icc profiles 
>>for printing with the UC inks that will yield a low gamut and no 
>>metamerism?
>>
>>Carl
>>
>>On Sunday, September 19, 2004, at 03:45  AM, Ernst Dinkla wrote:
>>
>>snip..
>>
>>
>>>There's a profile editor that uses the original ICC CMYK printer
>>>profile but takes out as much color as possible for a grey only
>>>ICC profile (Rich Grey ?), will work like QTR in a sense, long
>>>black generation etc. Someone mentioned it on the colorsync list
>>>a long time ago.
> 
> 
> For any inkset as I remember, but a CMYK printer profile that 
> also has the black generation etc incorporated.  For a RIP that 
> can handle CMYK printer profiles.  So not an RGB printer profile 
> for an Epson driver for example.  The thread at that time didn't 
> discuss metamerism but given the same goal, neutral greys and 
> less color use it would give less metamerism too I think.
> 
> One way to get my memory refreshed is by asking for such a 
> profile in the colorsync list. Rich Grey didn't google.
> 
> Ernst

So far, the replies on the colorsync list were:

In a message dated 9/19/04 11:43:44 AM, E.Dinkla@... writes:



 >> A long time ago I asked a question in this list about the use of
 >> printer profiles for B&W printing with CMYK inksets only.
 >> Neutrality of the greys as the one and only goal.
 >> Someone replied that they made profiles like that called "Rich
 >> Grey ?" Based on an existing printer profile for a CMYK inkset
 >> they edited the profile to deliver a lower gamut with that
 >> inkset, suppress metamerism and increase consistency. I guess a
 >> long black generation and setting the saturation as low as
 >> possible does the trick.
 >> Anyone familiar with that Rich Grey profile method?
 >>


Given that a rich black has lots of CMY component in it, this 
would actually
be a poor gray, or a weak gray, in that it would have minimal 
CMY. The next
question would have to be: what type of device, and inks, since 
reducing
metamerism depends on what inks are causing it. If its 
UltraChrome pigment inkjet
inks, then   removing all yellow, and using the warm black (and 
warm gray in
those printers that offer light black) plus just enough cyan and 
magenta to
neutralize the results would probably be what you are 
describing... but that
requires a RIP, and ink channel control in the profile, or in the 
RIP. This would be
rich compared to black ink only, but would reduce metamerism 
compared to full
CMYK grayscale printing.

C. David Tobie
Product Technology Manager
ColorVision, Inc.
CDTobie@...
www.colorvision.com


 >> Anyone familiar with that Rich Grey profile method?


X-Rite's ColorShop X can indeed create such a profile from an 
existing RGB
or CMYK output profile.

Andrew Rodney
http://digitaldog.net/

end of quotes, and no reply of the man that at that time 
answered. Will keep you informed.

Ernst