Digital BW, The Print

Hi Jeff,
After additional microscopic examination of a greyscale (printed in Color), I can conclusively state:
the Epson2000P driver 
1) uses Black ink only above the 80% black level
2) the full color CMs are used from 50% and above
3) the PC and PM is used from 1% to 50%
4) Yellow is used throughout the range (perhaps not above 95%)

It seems that the grey shades are pretty much a balance of C and M, so it probably does not matter which is the darker tone, but there is ( perhaps metameristically ) an increased magenta tint in the darker shades. And, if one was to print a color photo directly with a Hex grey set of inks, it Is required for the magenta to be the darker ink for image fidelity.

Also, from what I can observe, it seems incorrect for the PCe to nearly equal the M in density. I plan to create one new shade for the first trial and resequence the inks. I ordered some empty carts to test my 'theory' before filling the CIS set.

Later,
Alex


--- In DigitalBlackandWhiteThePrint@y..., "jrandall1149" <jrandall@c...> wrote:
> Alex:
> 
> My working knowledge of the Epson driver (others please step in and 
> help/correct me because I am beyond my detailed technical knowledge 
> of drivers) is that it does not not see in grayscale, meaning that it 
> does not cause the ink in the Cyan position to fire when it is sent a 
> certain brightness/luminosity/lightness/density value. It fires when 
> sent a CMY color of a given brightness. In grayscale mode, I suspect 
> that the CMY information is close to equal creating various shade of 
> gray depending on the brightness information sent to the driver.
> 
> I haven't checked it out, but I suspect that the Woolf workflow would 
> work with the gray inks in any positions (but K=K) because it treats 
> all the gray inks essentially the same -- hence the brightness of 
> each Woolf dot is the same until K kicks in at about 50%.  BTW, the 
> Woolf curve is not very aggressive and seems to fit my understanding 
> of your goal of mild correction.
> 
> The only way that I know of to control the individual inks in any 
> particular position with the Epson driver is to assign colors & 
> brightnesses to the grayscale image--this is called partitioning. 
> Roark, Brandon, and Randall workflows (found at MIS 
> www.inksupply.com) are examples.  
> 
> You may have hit on something about the sequence of ink deposition 
> creating an additional variable.
> 
> Jeff Randall
> 
> 
> > >