On Jan 5, 2018, at 6:33 PM, Graeme Gill <graeme@xxxxxxxxxxxxx> wrote:
forums@xxxxxxxxxxxxxxxxxxx wrote:
Hi,
My question is this: is there any way (with Argylle) to build an output ICC
that prints
measurably linear?
if an output profile is any good (i.e. has sufficient accuracy), then it will
let you print with any transfer curve you want. The overall response (of
course)
depends on the source profile you choose for your printing workflow.
Aka: If I print X target, measure, build icc, and then print a second
validation target
(using the ICC) with a set of grayscale values dark to light with a certain
rendering
intent (Absolute?), those values will be measurably equidistant to each
other from
dMax to dMin.
Equidistant on what scale ?
Density ? (i.e. you mention dMax/dMin, so log reflectance ?),
Reflectance ?
Perceptually linear (i.e. L* like ?)
In other-words, I’m trying to eliminate the “appearance matching” found in
ICCs
and simply make the icc print linear as measured by a spectrophotometer for a
given printer/paper/ink.
There's no escaping some degree of "appearance matching" - ICC profiles work
on
the basis of colorimetric appearance, i.e. that the observer is a tri-stimulus
observer. You can choose the overall luminance transfer curve by choosing or
building
a desired source profile, and choosing an intent (i.e. one of the colorimetric
intents) that makes no adjustments for lightness appearance changes with
viewing
environment.
Cheers,
Graeme Gill.
Attachment:
signature.asc
Description: Message signed with OpenPGP
