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QTR-Quadtone RIP

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C6C base on inkjet papers

2016-03-08 by janbecket.net@...

When MIS shifted the Eboni 6 formulation, I decided to also shift my base from C6B to C6C. This is the base formulated by Paul Rorark primarily for use on Arches traditional watercolor paper. I downloaded the set of curves from his website, linearized w/ my Colormunki and got perfect, straight-line graphs on the first try. I like the images Iʻm getting on Arches Aquarelle Hot Press with the curves.

On the downside, I need to make some larger prints for an upcoming exhibit on my usual roll paper, Epson Hot Press Natural. I cannot come up with anything better than a lumpy, misshapen graph. I was lucky to get even that - most of the day I received the message that the curve could not be created because the L values were not increasing at a constant rate. Never had that problem before w/ the Colormunki.

The EbVT-EpsonHPn-carbon curve I downloaded printed so dark in QER Calibration Mode that my Colormunki could not distinguish among most of the lower values, and in fact the ink was visibly puddling on the paper. I finally ended up setting ink limits to 25 - and the resulting print was still very dark. With the curve I obtained, the prints are now far too light. Something is not working ...

Thanks in advance for any suggestions!

The L values I obtained, such as they are, from the 21-step wedge are as follows:

96.546355 91.597322 72.622701 65.389964 54.04039 46.870139 40.510065 36.751712 34.591375 30.365277 26.656638 22.814636 20.605356 19.527912 19.167863 18.58482 17.55425 17.256046 16.923388 16.529925 16.253277


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