Re: NEC PA271Q "Native" chromaticities
Re: NEC PA271Q "Native" chromaticities
- Subject: Re: NEC PA271Q "Native" chromaticities
- From: Andrew Rodney via colorsync-users <email@hidden>
- Date: Mon, 6 Jan 2020 07:49:37 -0700
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/ <http://www.digitaldog.net/>
> On Jan 5, 2020, at 10:12 PM, David Scharf <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
>
>
> 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>
>>> <mailto: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/>
>>> <http://www.electronmicro.com/> <http://www.electronmicro.com/>
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