RE: perceptual differences in Lab deltaE
RE: perceptual differences in Lab deltaE
- Subject: RE: perceptual differences in Lab deltaE
- From: Roger Breton via colorsync-users <email@hidden>
- Date: Tue, 7 Jan 2020 07:14:16 -0500
Hi Simon,
Interesting observations. Your findings corroborates my very own, humble
experience. If I understood you correctly, you and your students found that our
color vision is "less forgiving" of color differences in neutral colors and
"more forgiving" in saturated colors?
I agree intuitively that observing color side by side does not "forgive" much 😊
I'm curious how were you able to print chart patches with as little as 0.3
deltaE (which flavor?) color differences... Suppose I was to replicate your
findings with my students?
Best / Roger
-----Original Message-----
From: colorsync-users
<colorsync-users-bounces+graxx=email@hidden> On Behalf Of
simon--- via colorsync-users
Sent: Tuesday, January 7, 2020 5:48 AM
To: Roger Breton via colorsync-users <email@hidden>
Subject: perceptual differences in Lab deltaE
Hi Andrew,
I did some tests a few years ago by printing charts patches to exhibit small
deltaE variations. My conclusion at the time was that the limit of deltaE of ≤
1 was fine for colours with values of a or b > ±10 but as the colour approached
the neutral (L) axis in the range 40 ≤ L ≤ 70 smaller values of deltaE were
clearly visible. Most of my test subjects could detect differences of about
0.3 when the patches were compared side-by-side, and (almost a neutral grey).
My conclusion from this was not surprising - for all my test subjects the Lab
space was not perfectly perceptually uniform, and detecting differences in
deltaE was significantly easier for values of -3 ≤ (a or b) ≤ 3 when comparing
patches side-by-side.
Simon
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