Re: [OM] Blue and Black or white and gold?

[Chuck Norcutt]

I was looking at an RGB histogram in PhotoShop.  I used levels to cut 
the red and green.  When I did the dress turned blue and black.
Chuck Norcutt

On 2/27/2015 6:11 PM, C.H.Ling wrote:
> Histogram won't tell color, RGB values does, the dress is blue and black
> according to RGB values although the black is not very pure (somewhat
> brown).
>
> C.H.Ling
>
> ----- Original Message ----- From: "Chuck Norcutt"
> <chucknorcutt@xxxxxxxxxxxxxxxx>
>
>
> I saw that and wondered what was going on.  As far as I'm concerned it's
> a case of color blindness.  I downloaded the image and I see white and
> gold.  Looking at the histogram I can see why.  The histogram says I
> should be seeing white and I am except for a small blue tint due to the
> dress being in shade.
>
> When I adjusted the image to drastically reduce the red component and
> slightly reduce the green component (a common form of color blindness)
> then I see that the white has turned blue and the gold has turned black.
>
> But 25% is a pretty large number for color blindness although it does
> vary significantly in different populations because of the genetic
> component.
>
> Wiki says:
> Color blindness affects a significant number of people, although exact
> proportions vary among groups. In Australia, for example, it occurs in
> about 8 percent of males and only about 0.4 percent of females. Isolated
> communities with a restricted gene pool sometimes produce high
> proportions of color blindness, including the less usual types. Examples
> include rural Finland, Hungary, and some of the Scottish islands. In the
> United States, about 7 percent of the male population—or about 10.5
> million men—and 0.4 percent of the female population either cannot
> distinguish red from green, or see red and green differently from how
> others do (Howard Hughes Medical Institute, 2006). More than 95 percent
> of all variations in human color vision involve the red and green
> receptors in male eyes. It is very rare for males or females to be
> "blind" to the blue end of the spectrum.
>
> Chuck Norcutt
>
> On 2/27/2015 11:09 AM, C.H.Ling wrote:
> > There is an interesting discussion going on the Internet.
> >
> > http://www.businessinsider.com/white-and-gold-black-and-blue-dress-2015-2
> >
> > Here is the votes in our house -
> >
> > Blue and Black - me, my wife and our young son.
> >
> > White and gold - our elder son.
> >
> > One survey says 75% see white/gold and 25% see blue/black, I never
> > thought this would happen.
> >
> >
> > C.H.Ling
--
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