Re: Comparing L*a*b* measurement scales: Photoshop vs Xrite
Re: Comparing L*a*b* measurement scales: Photoshop vs Xrite
- Subject: Re: Comparing L*a*b* measurement scales: Photoshop vs Xrite
- From: Florian Höch <email@hidden>
- Date: Thu, 09 Apr 2015 21:16:30 +0200
Am 09.04.2015 um 20:26 schrieb Mike Pucher:
> I have a set of L*a*b* measurements of color charts that I created with a
> i1Pro2 spectrophotometer. The Xrite software exports L*a*b* values on a
> scale of L*:0-100 and *a*b*: -100 to +100*.
Is that really the case? It would surprise me, because the range of a*
b* is not limited, and even less likely scaled.
> I've written a script for Photoshop to automate the calculation of specific
> metrics of captures of those charts, but there's one snag: Photoshop
> displays L*a*b* values on a scale of L*:0-100 and *a*b*: -128 to +127*.
This is due to the ICC specification which defines an encodable range of
a* and b* of -128 to 127. Values outside that range are not encodable in
an ICC context, and I guess that's why it's like that in Photoshop.
Florian.
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