Digital BW, The Print

Roy,

 

That sounds reasonable.  So, basically, as David says, ".its all a matter of
sending RGB values 
to the printer,."  But in addition to this the software can take advantage
of a 16 bit path and also more points on the curves.  

 

What I don't hear, however, is that profiling software can alter the gray
ink substitution algorithms of the driver in printers like the Epons 2400.
That is, for example, as I understand it, the Epson k3 printers in ABW mode
use more gray ink in the mix than in RGB mode, at least for rather neutral
prints.

 

Has anyone ever quantified this difference?  With, for example, a neutral
file (or slightly warm one), what amounts of each ink are used in the image?
Does the RGB approach use more color ink in the image than ABW?  If so, how
much?

 

Paul

www.PaulRoark.com <http://www.paulroark.com/>  

 

 

 

 

  _____  

From: DigitalBlackandWhiteThePrint@yahoogroups.com
[mailto:DigitalBlackandWhiteThePrint@yahoogroups.com] On Behalf Of Roy
Harrington
Sent: Wednesday, December 06, 2006 1:39 PM
To: DigitalBlackandWhiteThePrint@yahoogroups.com
Subject: Re: [Digital BW] Canon iPF 5000 Printer

 


Not really. It's the same basic thing -- as long as we're talking grayscale
input and RGB output workflow that you've used for a long time. An RGB to
RGB transformation can be 3 dimensional i.e. the R output can depend on all
3 input RGB channels.

Some details are a little different:
In PS you are limited to number of points (14 isn't it?).
The point values are just 8 bit (0 to 255), but the interpolation is 16-bit
as long as your data is 16 bit.
CMM can have more points and they are 16bit, but the points have to be
evenly spaced.
PS uses nice smooth cubic splines to connect points, CMM uses just simple 
linear interpolation.

Roy

--- In DigitalBlackandWhit
<mailto:DigitalBlackandWhiteThePrint%40yahoogroups.com>
eThePrint@yahoogroups.com, "Paul Roark" 
<paul.roark@...> wrote:
>
> Is there any difference in the Photoshop-to-driver connection or interface
> that gives profiling software like PFP any more or less control than what
I
> can theoretically get with RGB image adjustment curves used in Photoshop?
> 
> 
> 
> Paul
> 
> www.PaulRoark.com <http://www.paulroar <http://www.paulroark.com/> k.com/>

> 
> 

 



[Non-text portions of this message have been removed]