QTR-Quadtone RIP

Stay on this thread, RF. I think we are both about to find out. 

I, too, have created standard ICCs but not ventured into RGB ICCs yet. I have a new ink/paper combo that uses a curve to get the results I want, but now I want to perfect the ramp, which is already pretty good. 

If I understand this right, the difference between ICCs and RGB-ICCs is that the latter uses RGB information to control which ink 'colors' are being used to create the B&W grayscales. With the RGB-ICC the monotone image is effectively converted to an RGB image with the required curve applied within the printer driver, eliminating the need to convert the image and apply a curve before printing. Not that applying a curve is a big deal, but you wouldn't be able to do it in Lightroom, you'd have to use Photoshop. With an RGB-ICC you could print the image right out of LR using the appropriate RGB-ICC in your printer setup. 

Paul Roark has made a couple of suggestions and using his instructions, http://www.paulroark.com/BW-Info/Embedding_Photoshop_Curves_in_ICCs.pdf, I expect that I can give this a whirl tonight. I have some questions but I'll see if I can work past them before looking for help. 

If this works, I'll post my results and any comments that clarify or assist with working through the instructions. 

Homer Shannon  

--- In QuadtoneRIP@yahoogroups.com, "rfsteckmeyer" <steckmeyer@...> wrote:
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> I'm a newbee and trying to print with the QTR process.  I am making icc profiles but it is not obvious what the functional difference is between the two programs.  Does not QTR require a gray scale image to print?  When is the RGB version used and why?  Thanks
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