I think the most practical approach is to try and balance the scale.for each colour to achieve a fairly smooth rendition of the gradient. After that, in gum printing in my opinion is not so relevant to seek precision and you can balance the colour rendition with practice.
Tha approach I told you about is what I am trying to do because having a hp z3200 i can experiment with a specific process developed by hp itself, which is only an adaptation of a colour managed workflow.
A flatbed scanner will do for example, if you use one of the methods available (i am fairly confident with the Charthrob script just to mention one). They all do the same thing. A densitometer or a spectrophotometer will be more precise, but a scanner will do fine to balance the "scale" of each individual color.
Will not do any good to create a colour managed workflow, that is... putting all the colors together and create your own tecnique color space, which is an entirely different matter.
If you haven't yet, I recommend you to read Christina Anderson's books on gum printing, they tell you everything you need to know.. even more. In her books you will appreciate how gum is a tremendously flexible tool to develop your own way of express things. I began a few months ago, it is fascinating!
Bye and have fun!
Il 05 mar 2018 17:05, "Sébastien Brias sebastien.brias@gmail.com [QuadtoneRIP]" <QuadtoneRIP@yahoogroups.com> ha scritto:
Thank you Simone,I haven't a spectrophotometer, just a flatbed scannerif i separate each channel in PS and apply the dedicated curve to each colour,will it do the job?