ProfileMaker Editor 4.0 question(s)
ProfileMaker Editor 4.0 question(s)
- Subject: ProfileMaker Editor 4.0 question(s)
- From: Darrin Southern <email@hidden>
- Date: Sat, 13 Apr 2002 17:16:57 +1000
I am currently working through the functions and features of ProfileMaker
Editor 4.0 (Mac OS X beta to be exact) and would like the wisdom of those
who may have gone before me . . .
I am looking at the Update Profile function, where the documentation
suggests this is where "post-linearised" can be performed.
The process is to print the Calibration chart, which version 2.0 has
separate C, Y, M, K values for 100,95,90,75,50,25,10,5,0 percentages.
This chart is then read in through the Measure Tool, which creates a text
file that defines each patch as XYZ and Lab data.
I have set up a Source (Cromalin profile) and Destination (HP inkjet) using
Absolute Colorimetric and I have chosen to edit the Lab>CYMK profile
direction of the Destination profile first.
Within the Update Profile Tool, I have selected the reference text file for
the Linearization Chart 2.0 and also the Measurement data file that I made
from the printout from the inkjet, which was printed without any color
management within the postscript rip.
This has then made adjustments to the Graduation Curve Tool, which the image
preview shows the after effects of the changes, as you would expect.
Have I followed the process for fine tuning the inkjet profile correctly ?
I am then assuming that if I get the Linearization Chart 2.0 tiff proofed to
the Cromalin, I can then update (post-linearise) this profile, but selecting
the Source Profile's CYMK>Lab direction.
I could also take a 'canned' Cromalin profile, and a proof that has the
correct control strip (or the Linearization Chart 2.0) on it, and read these
patches to closer match by Cromalin that I have not profiled.
I could have just chosen one profile within the opening Profile Editor
window, but I need to be careful to edit it in the correct direction, based
on whether it's a source or reference profile.
Do color rips like BEST keep the CYMK>Lab and the Lab>CYMK keep the
rendering intent chosen for both directions, or is the CYMK>Lab conversion
perceptual, and the CYMK>Lab conversion based on what is chosen in the rip ?
I can then edit the Grey Balance, which this is a great tool to tweak the
amount of K being used, so that I can control the overall saturation, or the
appearance of the amount of ink on the paper, without editing the neutral
balance of the grey within the output.
Then we have Global and Selective edits, which should be last resort edits,
as these should be right in the original profiles, but fine tuning is OK.
You should check your 2D and 3D views of the two profiles, to see that your
inkjet (Destination profile) space can reach the colors in your Cromalin
(Source profile) space. It might be time to redo your calibration and set up
the top end densities and total ink weight of your inkjet, then re-profile.
The last two editing options are the white point, and it's great to be able
to change the workflow white point in standard CYMK values.
I am just using the Cromalin and HP inkjet as examples here, as the Source
and Destination profiles can be anything.
I would be interested in hearing from others who have attempted similar
profile edits,
Darrin.
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