What's pretty amazing to me is that it's well-known that about 8% of men
are colour-blind in some way (Only half-percent women)
Yet product industrial designers continue to try to use one multi-colour
led as a status indicator. The height (or depth) of the practice that I've
encountered is on BT (British Telecom) Home Hubs (modem/routers) which use
one led to show green, orange, red, purple and blue. I have to call my
in-house-colour-advisor every time it's not doing what it should...
Jez
On Mon, 29 Oct 2018 at 18:33, Ken Norton <ken@xxxxxxxxxxx> wrote:
> > It’s interesting to me because I lecture on vision as part of my job,
> and to day I’ve spoken only about rods and cones (and photo-sensitive
> ganglion cells), never about the 3-colour properties of most people’s cone
> cells. And now I know that there are people with 4-colour cells.
>
> Several years ago I did quite a bit of research into this. The people
> with four-color (not colour) cones are rare enough to not be
> considered part of the normal human race. :) HOWEVER, there are
> people who have rods with some pigment.
>
> It's pretty fascinating that the human eye does not actually "see"
> red. The red cones see a wide band of color from red down to yellow.
> This band is overlapped by the green cones. To determine "red", the
> human vision system sees the absence of green. So if the eye sees
> green and red, it's actually yellow/orange. If it sees red but not
> green, then it's actually red.
>
> This is very different than most digital sensors that traditionally
> have had pretty narrow-band filters with little overlap between blue,
> green and red sensels. Canon sensors are very wide-band with a thin
> pigment. The color accuracy is secondary to dynamic range. Color is
> determined by the same method as the human eye - using "mix-minus"
> calculations. (done on-chip at time of exposure, pre-raw). The Kodak
> sensors used a very deep filter that preserved color accuracy, but at
> the expense of bit-depth and sensitivity.
>
> Not much of that matters to me at the moment. Everything is monochrome
> in Alaska now.
>
> AG Schnozz
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