Comparing L*a*b* measurement scales: Photoshop vs Xrite
Comparing L*a*b* measurement scales: Photoshop vs Xrite
- Subject: Comparing L*a*b* measurement scales: Photoshop vs Xrite
- From: Mike Pucher <email@hidden>
- Date: Thu, 09 Apr 2015 11:26:09 -0700
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*.
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*.
I assume, but I haven't been able to find confirmation, that it is a
mathematically linear conversion (mapping) from the *-100 to +100 a*b*
scale* to the *-128 to +127 a*b* scale.* Can anyone verify this? Or point
me in the direction of the proper way to map the values between the two
scales?
Thanks,
Mike
--
*Mike Pucher*
*Sr. Image Capture Specialist*
*Animation Research Library*
desk: 818.544.4185 (8223-4185)
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