Re: Gum Calibration 2 (How to read color samples?)
24 Ekim 2008, Cuma, 11:18 pm tarihinde, Katharine Thayer yazmış: >> Hi Loris, >> >> Maybe but, >> >> All my pigments are diluted 15ml to 150ml paint to gum. Any less >> and they get very wishy washy (insipid). >> >> David >> >> >> On Oct 24 2008, Loris Medici wrote: >> >> David, could it be that the pigment concentration is too much? > > > Greatly unlikely at those concentrations, IMO. Hello Katharine, Is that for my question to David or David's answer to it? > But I have to agree > with David; that's what I've seen again and again, that often when > people calibrate their layers individually they then find to their > surprise that such calibration of the separate layers doesn't sum to > a perfect tricolor print, from any number of standpoints. What could be a better way to do it? I felt I was in the right direction; 1. Choose the right pigments (my choice seem to be foolproof - as I'm using either the main secondary colors (for cyan PB15:3 and magenta PV19 Rose) and a yellow very close to the ideal (same hue angle, but slightly darker)... 2. Balance the pigment amounts (my current start point is 1+3 PY151, 1+5 for PV19 Rose and 1+7 for PB15:3) so that none will overpower the others... 3. Test by calibrating each individual color first and then print them (as 21-step tablets) on top of each other (hoping to get a neutral result in each step) later, inspect and dilute more (proportionally, trying to balance any shift from neutral - if present) until black is convincing black, middle gray is middle gray and highlights are highlights. Does it sound good to you? Regards, Loris.
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