Hey David, You're absolutely right. Not everyone "sees" color exactly the same way but, as I was once told by Mark Fairchild, on "average", we see color the same "way". I agree with you that the viewing conditions determine to a large extent the way we see color, and you could make the case that it would affect the "average" user the same way, too (I hope this makes sense?). How the patches are presented to the viewer, too, influences the way the color appear -- no question. Such a fascinating subject... / Roger -----Original Message----- From: colorsync-users <colorsync-users-bounces+graxx=videotron.ca@lists.apple.com> On Behalf Of David Scharf via colorsync-users Sent: Monday, January 6, 2020 11:19 PM To: colorsync-users@lists.apple.com Cc: David Scharf <electronman@roadrunner.com> Subject: Re: NEC PA271Q "Native" chromaticities Hey Roger, The threshold of differentiation is, I suspect, different for different people, taking into consideration the brain as "computer" or perceiver and the eye as camera or sensor. Environment will also be a big factor--or how the colors are presented: two patches close in color next to each other will be more easily distinguishable that those colors presented amongst other disparate colors. David -- DAVID SCHARF PHOTOGRAPHY