Fwd: dealing with printers
Fwd: dealing with printers
- Subject: Fwd: dealing with printers
- From: Hanno Hoffstadt <email@hidden>
- Date: Thu, 18 Jun 2015 15:34:59 +0000
- Thread-topic: dealing with printers
I'd say that standard reference data still are the basis for substrate calculated data.
The only extra information needed is the assumed substrate white (CIELAB).
So my vision is to print that LAB along with the control strip of the proof,
and anyone can check the proof control strip after entering these Lab numbers.
One could even imagine that this user interaction is not needed:
The paper white simulation which is measured could be compared against the standard,
and if different enough, could directly be used to substrate-correct the aim values
for the whole strip. Maybe informing the user that a custom white has been detected,
OK to proceed?
E.g. ISO 12647-2:2013 usually has a tolerance of 2 b* units for the PS
(= printing substrate) categories, and explicitly states in the preamble that
the standard can be applied to substrates outside if one uses a substrate
correction method like the informative one given in Annex B and other standards.
(A minor detail is the black XYZ needed in the formula, but this could be derived
starting from the 100 K value given in the standard.)
Hanno
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Message: 3
Date: Wed, 17 Jun 2015 12:19:37 -0500
From: Mike Stewart <email@hidden<mailto:email@hidden>>
To: colorsync-users <email@hidden<mailto:email@hidden>>
Subject: dealing with printers
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Now that we are moving to Substrate Calculated Data sets based on paper
white; how on earth do we communicate this to printers. Before OBA's we had
GRACoL, Fogra47 - just to name a few. We would colour manage our proofs to
GRACoL or Fogra47 (or some print specification), place an Idealliance
colour bar on each proof and the customer/printer could measure the colour
bar to see if we were in compliance or not to the particular specification.
Now we start from GRACoL Uncoated 2013, change the Paper White values,
create a new Data Set and proof to the new data set. Our colour bar on each
proof now becomes useless as it will never match to the original GRACoL
Uncoated 2013. How do we communicate this to a printer in Asia. How can
they now trust our proofs. Do we give them a small single row Press Type
Colour Bar that prints within the job itself and also give the printer the
specs. for that colour bar. If so, what are the specs. of that colour bar
(C,M,Y,K,R,G,B, grey balance swatches, etc). Data for that file would have
to be colorimetric and not solid ink and dot gain values I'm guessing.
Thanks
Mike Stewart
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