Re: Humans (and cameras and scanners) do not have a color gamut (?)
Re: Humans (and cameras and scanners) do not have a color gamut (?)
- Subject: Re: Humans (and cameras and scanners) do not have a color gamut (?)
- From: Rich Wagner via colorsync-users <email@hidden>
- Date: Mon, 13 Jan 2020 17:00:53 -0700
I agree with Florian’s responses below regarding how we “know” what animals
“see.” The parallel question is how we “know” what women with tetrachromatic
vision “see.”
There is a very good article from the BBC that describes this that might help.
https://www.bbc.com/future/article/20140905-the-women-with-super-human-vision
Here’s a short excerpt from the excellent story:
Proving that these people actually see the world differently has involved a
two-decade journey, however. Although the relevant combination of genes does
not seem to be especially rare – perhaps 12% of women might have four distinct
cones – many of the people that Jordan tested just didn’t seem to show any
differences in their perception. But by 2010, she had found a subject who
perfectly acted the part of a tetrachromat. Jordan’s “acid test” involved
coloured discs showing different mixtures of pigment, such as a green made of
yellow and blue. The mixtures were too subtle for most people to notice: almost
all people would see the same shade of olive green, but each combination should
give out a subtly different spectrum of light that would be perceptible to
someone with a fourth cone. Sure enough, Jordan’s subject was able to
differentiate between the different mixtures each time
<http://www.journalofvision.org/content/10/8/12.full>. “When you ask them to
discriminate between the two mixtures, a tetrachromat can do it very quickly.
They don’t hesitate,” says Jordan.
Unfortunately, much of the research in color perception is highly complex and
often difficult for the lay public to comprehend. Good science writers can
translate that research into language the lay public can understand. Poor
science writing leads to exaggerated claims and misinformation. That said, the
title of this article is a bit over the top. I don’t think these women have
“super human vision” any more than those who are colorblind have “sub human
vision.” Both have visual perception that is significantly different from the
average of our species.
—Rich
> OnMon, 13 Jan 2020 19:40:11 +0100, Florian Hoech
> <email@hidden <mailto:email@hidden>>
> wrote:
> [snip]
>> Not a single case can be made by anyone?s fisthand information about the
>> post processing by the brains of these animals. Who can know what they see
>> or apprehend?
>
> You can draw pretty useful conclusions (meaning they work well in
> real-life, thus supporting the respective theories) from all the
> scientific research that has been done. "Color" perception is not just
> "nice to have". Trichromats (like humans) have an evolutionary edge over
> (say) dichromats, e.g. when it comes to distinguish edible/nutritious
> from inedible/less nutritious food like fruits etc. When you look at the
> M and L cone responses of any trichromat, you can see that the responses
> of the "sensors" (cones) largely overlap. Yet, we seem to perceive the
> "end result", green and red, as very different colors (opposites even!).
>
>> Since humans communicate with each other about color we can build models and
>> references and so on. But animals? Yet, experts are quick to supply
>> examples of how things must appear to non-humans.
>
> I think you may be conflating the actual research with how it is
> presented (usually not by the researchers themselves), broken down and
> simplified in newspapers/magazines/articles, online and offline, meant
> for consumption by the general public.
>
>> When we grant that all of these theories are onto something about the ways
>> animals percieve color we account for their differences by describing them
>> in terms of ?gamuts?.
>
> I like the term "dimensions". A Tetrachromat has an additional dimension
> of "color".
>
>> Surprise: experts determine gamuts based on the sensor alone! They don?t
>> even seem to be the slightest bit unhappy about it.
>
> ...where? And who? Dimensionality alone doesn't really tell us much
> about gamuts.
>
> Florian.
>
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