David,
Drivers don't "think." The program just tells the printer to spit out inks according to the assumptions the programmers had about relative ink densities, with allocations among the color channels that were made to balance the assumed color inks.
So, the M-LM and C-LC Epson ink dilution ratio is approximately 30% dense ink to 70% clear base. Eboni-6 uses the same ratios for these same ink positions.
The drive assumes a dense black ink is in the K position, as it is in virtually all B&W inksets also.
The yellow color ink is very light in terms of density. So is Eb6-Y.
The fact that the Eb6 inks are shades of gray is irrelevant to what the driver does. The driver is clueless. If a grayscale file is the input, it's converted to CLcMLMYK according to how much of each of the OEM inks would be needed to make a neutral looking print. The fact that OEM inks are not in the carts is not a variable in the program (combination of computer software and printer firmware).
What is amazing about the Epson driver is that it can handle the huge variances in grayscale relative densities that I noted before. The main question I had with the beta Carbon Variable Tone inkset is whether the driver could handle a second K in the Y position. Amazingly, it did. Although, as I've noted in the PDF, the cross-over issues at the black end are tricky; I recommend people just copy the ends of the PS curves I've published. I had to use 1% step wedges to get the response curves smooth there.
Hope this helps ...
Paul
Again, I use QTR, not the Epson driver for my B&W printing. All of us on this forum are here for a reason. But, at one point Bob Zeiss disclosed to me that the MIS customer base was about 30,000 people. While I suspect that is now ancient history, I have not idea. The point is that this forum is not composed of average users. I work with high end fine art photographers/printers who use the Epson driver for Eboni-6. Profiling a rip is beyond what most people want to deal with.
Paul
On Tue, Nov 11, 2014 at 8:02 AM, David Kachel david@... [DigitalBlackandWhiteThePrint] <DigitalBlackandWhiteThePrint@yahoogroups.com> wrote:
The Eboni-6 design is Epson driver compatible.Paul,I must admit this baffles me completely. My take on this is that the Epson driver is only going to use a gray ink in the Yellow slot if it thinks a part of the image needs to be yellow, etc. To me, this means that various gray tones are going to be laid down in areas that make no sense at all.Please elaborate for those of us who are IQ challenged.;-)David Kachel___________________Artist-PhotographerFine B&W PhotographsPO Box 93Fort Davis, TX 79734