With regards to the software on the Chromira -vs- Lightjet, The software on the Chromira is fairly basic. You have the ability to balance 17 grey levels with a densitometer, using an iterative process. If you continue enough iterations, it will get each step to within the accuracy of the densitometer. This software is based on work I did both on the Raster Graphics electrostatic plotter many years ago, as well as more recently on a film recorder project I did. The iterative method works quite well, and will get you a good grey scale.
There is no 'built in' masking, or other provision to obtain color purity as is present in a color negative. There is an ICC engine in the printer which applies the printer's profile to the file, and this is what is responsible for color accuracy. I would imagine it is the same on the Light Jet. So, beyond the basic spectrum of the exposing light's ability to isolate the sensitivity peaks of the emulsion (which can limit the gamut if not properly optimized) the accuracy of the color is a function of the profile, which is usually made by the lab.
Regards - Jim
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