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The problem with using copy curve is that the blocking density for each point on the curve isn’t always consistent from one ink to an other. In your set up it would be better to use LK as toner 1, and yellow as toner 2, and then linearize each separately with the toner curve setting. The K channel is then linearized with the gray curve setting, and then you could linearize all three inks together with the qtr linearize= setting. I am not sure if it is a good idea to run a heavily dithered full dilution black in the highlights, so I would recommend having a LK/K grayscale partition with increased overlap, and linearized with my gray curve correction tool. Then run Y separately a toner partition linearized with its own toner curve.

Richard,

The actual UV blocking density of the PK and Y inks are virtually identical at all points on the curve wheb using the same ink Limit, and at Limit of 2X the value of PK and Y, LK is equal in blocking to the Y and PK. I have verified this with both densitometer readings and with actual prints of step wedges in process. The Cyan and Magenta are indeed way off in terms of blocking density at different points on the curve, which is why I consider them useless in profiling for alternative processes with the K3 ink set.

Sandy

QTR-Quadtone RIP

Re: Alt Process Internegative project

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