Digital BW, The Print

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "dpgoldenberg33" 
<dpgoldenberg33@...> wrote:
>
...
> 
> 1. At what levels is the Glop used?

You can see in those 1400 glossy curves how high the Blue curve goes
(yellow ink position = glop).  I think one the Iflord curve I opened 
it hits about a max of 40% in the mid-highlights.

> Is it constant with black density,
> or should it decrease as more ink is applied?

With just black firing the distribution might be different.  I just 
worked visually from 21-step test strips.  Where there was bad 
bronzing I added a little more glop -- very much a trial and error 
type of approach.

> 2. Is there a way to see what the actual ink levels are from 
> your ICC profiles?

The curves that are in the Zip file are the ones I used in the ICCs.  
I'm sure Roy could tell you what program is needed to open the ICCs 
and extract the curve information, but when they are opened with 
Notepad it looks like Romulan to me.

> If I apply the curve to an image in Photoshop, I can see
> what they are, but they are obviously expressed in terms of the
> current color model (Grayscale, RGB, CMYK).  If I look at the CMYK
> profile for the Kirkland Glossy (neutral), the yellow fixed at
> zero is at zero, and the black is linear from 0 to 100%.  
> But image has to go
> through the Epson driver as well, so I assume that the final ink
> values are different.  

Yes, and I suspect that in addition to the ink limit that is imposed 
by the driver, usually set by the paper type, the relationships we 
see in the curves is not applied to the inks in a linear fashion.  My 
general experience with writing these PS curves makes me think that 
the one unit moves near the top of the curve (highest ink output) 
adds much more ink per unit that near the bottom of the curve.  I 
suspect this is to offset the generally decreasing slope of the ink 
to density relationship as more ink is added.

Paul
www.PaulRoark.com