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 17:04:12 -0500
Andrew,
I'll start "humble", I'm only interested at this point to tell what type of
"information reduction" is at play between pixel values in a file and
measured pixel values on screen. For sure, we all *know* it's not a 1:1
relationship. Like, this is crazy, but I confess I never stopped to think
what happens in Photoshop when working in 16bit modes? Suppose my video card
can only honor 8-bits: can you imagine the huge "reduction" going behind the
scene between the image in the file and the image on screen? Now what
happens in the case of a 10-bit video card scenario? Assuming a 10-bit
capable display like your 271Q and my 271W, and Wire's UP2916? Surely the
reduction must not never be as severe. But I'd like to know, quantitatively,
what kind of "compression" are we talking about. For now, I'm only
interested in looking at R=G=B values, that will give plenty of data to
graph to play with. But I don't think I'll expand this to the whole 16.7
million (let alone 1.04 billion) colors.
/ Roger
-----Original Message-----
From: colorsync-users
<colorsync-users-bounces+graxx=email@hidden> On Behalf Of
Andrew Rodney via colorsync-users
Sent: Tuesday, January 7, 2020 3:25 PM
To: Roger Breton via colorsync-users <email@hidden>
Subject: Re: perceptual differences in Lab deltaE
So if (ugh that be hard) you're going to use your 16 million color test
file, what's going to happen if it's in Adobe RGB vs. sRGB vs. ProPhoto RGB
vs. the gamut and calibration of your display?
Andrew Rodney
http://www.digitaldog.net/ <http://www.digitaldog.net/>
> On Jan 7, 2020, at 1:21 PM, Roger Breton via colorsync-users
<email@hidden> wrote:
>
> Ilah,
>
> Glad you brought this up because that's exactly one my current "pet
> projects". My code is not finished yet but basically, I'm going to be
> sweeping the entire "1024" scale with my instrument, to determine,
> exactly, what is what. I'll be glad to report as soon as I'm done -- can't
wait!
>
> / Roger
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