perceptual differences in Lab deltaE
perceptual differences in Lab deltaE
- Subject: perceptual differences in Lab deltaE
- From: simon--- via colorsync-users <email@hidden>
- Date: Tue, 7 Jan 2020 10:47:34 +0000
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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