Re: NEC PA271Q "Native" chromaticities
Re: NEC PA271Q "Native" chromaticities
- Subject: Re: NEC PA271Q "Native" chromaticities
- From: David Scharf via colorsync-users <email@hidden>
- Date: Mon, 6 Jan 2020 16:32:18 -0800
Hi Andrew,
My point was that when there are colors separated by an extremely small
increment, they may be indistinguishable from each other and we may may
perceive them to be the same color--so not invisible but visible--just
not perceptually different. Seems like we are making two different valid
arguments.
DAVID SCHARF PHOTOGRAPHY
*DAVID SCHARF PHOTOGRAPHY*
Scanning Electron Microscopy
http://www.electronmicro.com
On 1/6/20 6:49 AM, Andrew Rodney wrote:
David, R0/G255/B0 in ProPhoto RGB isn't a color! And there are many,
many other triplets of such numbers in that working space that are
equally invisible. You can't see it period. It is not gray, it's
invisible, it isn't a color. Do try plotting it's gamut against the
spectrum locus.
Please don't confuse a device value, a triplet of numbers as visible
colors as there are such sets of numbers that are not visible.
Want to use the (ugh) term, "Illegal colors" OK, but that doesn't
change the fact that again, R0/G255/B0 in ProPhoto RGB isn't a color.
Andrew Rodney
http://www.digitaldog.net/
On Jan 5, 2020, at 10:12 PM, David Scharf <email@hidden
<mailto:email@hidden>> wrote:
So you're saying that when these "color" numbers come up that we will
see only gray? Nah, I don't think so. I think that most of us
understand the Physics and and perceptive aspects of color. Perhaps
you mean that these "invisible" colors do not exist as perceptually
different from other colors close by in number?
DAVID SCHARF PHOTOGRAPHY
*DAVID SCHARF*
On 1/5/20 5:26 PM, Andrew Rodney via colorsync-users wrote:
I'm talking both.
Color, is a perceptual property. So if you can't see it it's not a color. Color
is not a particular wavelength of light. It is a cognitive perception, the
excitation of photoreceptors followed by retinal processing and ending in the
our visual cortex, within our brains. Sounds like biology to me.... As such,
colors are defined based on perceptual experiments.
Fairchild's "Color Appearance Models". Page 1!
"Like beauty, color is in the eye of the beholder. For as long as human scientific
inquiry has been recorded, the nature of color perception has been a topic of great
interest. Despite tremendous evolution of technology,fundamental issues of color
perception remain unanswered. Many scientific attempts to explain color rely purely on
the physical nature of light and objects. However, without the human observer, there is
no color".
Further on the same page:
"It is common to say that certain wavelengths of light, or certain objects are a
give color. This is an attempt to relegate color to the purely physical domain. It is
more correct to state those stimuli are perceived to be a certain color when viewed under
specific conditions".
Page 1 paragraph 2 of Digital Color Management by Giorgianni and Madden:
"But color itself is a perception and perceptions only exist in the mind".
Page 11 of The GATF Practical guide to Color Management:
"Although extensive research has been conducted, we still not completely understand what
happens in the brain when we "see" color. The visual sensation known as color occurs when
light excites photoreceptors in the eye called cone cells".
Page 75 of Understanding Color Management by Sharma:
"Color is an impression that we form in our brains".
On Jan 5, 2020, at 5:57 PM, David Scharf<email@hidden> wrote:
Hi Andrew,
I think your talkin color science and engineering and I'm talkin biology.
Inability to differentiate close colors does not mean their non-existence or
imperceptibility. That's not silly, its actual!
DAVID SCHARF
http://www.electronmicro.com <http://www.electronmicro.com/>
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