Re: Finding CIELab Values from Target Chart TIF
Re: Finding CIELab Values from Target Chart TIF
- Subject: Re: Finding CIELab Values from Target Chart TIF
- From: Joseph Yates <email@hidden>
- Date: Thu, 29 Apr 2010 15:24:09 -1000
- Thread-topic: Finding CIELab Values from Target Chart TIF
on 4/29/10 12:15 AM, Peter Skarpetis wrote:
>> Well AFTER the printers are calibrated by the PhaserMatch software I¹m
>> using a device link to ³simulate² ISOCoatedv2 on the printers.
>> Would this be the CMYK profile I would use in the ColorSync utility?
>
> Yes it would. this would give you the expected Lab values of the patches on
> the printed sheet, after calibration.
>
> Peter
Well I should explain why in fact I'm trying to ascertain CIELab values for
the 140 Patch CMYK Chart :-)
I'd like to create a method or procedure for verifying (evaluating) the
PhaserMatch calibrations.
Recently we had reproductions coming out of 1 Phaser machine much lighter
than usual - even after repeated PhaserMatch calibrations. It wasn't until
several hours of troubleshooting that I discovered a toner density setting
had been reset due to a recent Xerox Tech support repair.
I realized though - during these repeated PhaserMatch calibrations - that I
really had no eay method of verifying or determining if in fact the
PhaserMatch calibrations were working or returning the machine back to it's
linearized state - in which it was profiled and in which it's device link
profile was created from.
My thinking here is that since PhaserMatch returns CIELab values for the
measured printed patches - one could also re-print/re-measure and get CIELab
values AFTER the calibration was sent to the printer. With these sets of
pre-calibration and post-calibration values - one could compare them to some
sort of "reference" numbers to see if indeed the Calibrations are moving the
machine closer or farther away from this linearized state.
Am I headed in the right direction here here?
Joseph
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