Message
Re: The limits of working with QTR
2017-09-02 by sanking@...
Sidney,
Interesting post, and your experience serves to emphasize the importance of establishing density range requirements for the alternative process that reflect as closely as possible the exposure scale characteristics of the process, especially where POP/self-making is involved, as it is with carbon transfer and several other alternative processes. If one tries to force a correction curve on a profile where the DR of the digital negative is not closely matched to the ES of the process, the result will be a very abrupt correction curve that will cause digital noise and prevent smooth transitions of tones. In cases where the DR and ES are closely matched a correction curve applied with in a QTR profile will by necessity be relatively smooth, which assured a smooth transition even with self masking processes.
The other big issue with smoothness is that it is highly dependent on the use of inks are close in UV transmission blocking and similar spectral response, especially in the critical area of the negative shadow densities, which are converted into print highlight densities.
Sandy