>>Gray Working Space
The first is gray-lab.icc which is an abstract gray space to be used as your gray working space in Photoshop. It spaces the grayscale values linearly with respect Lab or Luminosity. As opposed to a Lab space which is for color this space is a single channel gray space with the same spacing as Lab. Compared to Gray Gamma 2.2 it displays slightly darker through the mid values but opens up the deep shadows from K = 90 to 100%.<<
So neither linear or Gamma 2.2 but closer to the last.
What should be the ideal workflow today is harder to say. Roy may shed a light on that.
Met vriendelijke groet, Ernst
http://www.pigment-print.com/spectralplots/spectrumviz_1.htm
December 2014 update, 700+ inkjet media white spectral plots
I understand that. I understand it only too well. Indeed that was precisely the point of my post - that they *are* two entirely different philosophies about how to print monochrome using QTR.
Despite this, Roy's post suggested that you could mix these two different approaches, and use the ICC approach to linearise the Cone curves. As I demonstrated, you can't, or at least not in the way that he suggested and still work within the Cone approach. It's not that simple. I confess that I thought it was, but it tried it and see that it's not.
So two questions remain. 1. is there a way to linearise the Cone curves, in a way that Jon Cone would think is linear? Michael seems to have an approach. If you look at the second image I posted, you see that after conversion to the ICC, the luminosity values lie on a smooth curve. In theory it should be possible to apply a Photoshop curve which is roughly the inverse of the curve you see in that image. That's what I'm trying. Partial success so far.
2. I'd really like to get a better understanding of how two such eminent people in the monochrome world use the word "linear" to mean something so different. I understand what Jon Cone means - you see it in the linearisation plots. What does Roy mean?
Brian
---In QuadtoneRIP@yahoogroups.com, wrote :Jon's curves assume Gray Gamma 2.2 input files. Roy9;s curves assume linear input files. Two fundamentally different approaches using the same tool (Quad Tone RIP).
Terry.