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Old 02-09-2018, 02:36 PM   #211
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You people are all so boring. I want interesting colored electronics, dang it!
At least we've moved up to black and white from that ugly computer beige of the 80s/90s.
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Old 02-10-2018, 11:20 AM   #212
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At least we've moved up to black and white from that ugly computer beige of the 80s/90s.
The color amber is coming back. It is disguised as "night light" or "smart light" or "comfort light." Maybe soon green as alternative to amber will come back too.
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Old 02-10-2018, 09:42 PM   #213
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The color amber is coming back. It is disguised as "night light" or "smart light" or "comfort light." Maybe soon green as alternative to amber will come back too.
I doubt it. Orange is being used because it contains no blue, and blue is supposed to interfere with sleep. Personally I doubt that removing blue light on an ereader will improve sleep but a lot of people do believe it and that makes it worth adding the feature to avoid blue.

Green light does contain a lot of blue so there's no marketing gain from offering it.

I'm not sure this is related but I remember in the early days of monitors when green screens and amber screens were the options our company bought green screen monitors and we had a lot of complaints about eyestrain. A bit of research found that that was a common problem with green screens so we bought a bunch of amber monitors and gave them to anyone who wanted them, including me. It made a lot of difference. Complaints about eyestrain were drastically reduced. I had a lot of eyestrain problems with green screens and hardly any with amber monitors.

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Old 02-11-2018, 01:31 AM   #214
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Originally Posted by barryem View Post
Green light does contain a lot of blue so there's no marketing gain from offering it.
Cyan is between green and blue. If it looks green, there shouldn't be any blue in it, much less a lot.
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Old 02-11-2018, 09:59 AM   #215
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Originally Posted by j.p.s View Post
Cyan is between green and blue. If it looks green, there shouldn't be any blue in it, much less a lot.
I was always taught that green is created by mixing yellow and blue together. Is that wrong?

Shari
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Old 02-11-2018, 10:24 AM   #216
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Quote:
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I was always taught that green is created by mixing yellow and blue together. Is that wrong?

Shari
That is in an "Additive" color scheme, such as when mixing paint or dyes. Curiously, the physics of light and color are different.
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Old 02-11-2018, 01:09 PM   #217
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I was always taught that green is created by mixing yellow and blue together. Is that wrong?

Shari
The color we perceive depends on the mixture of light wavelengths and brightness entering our eyes, but it is complicated by the way the light detectors in the eye work. Yellow is a pure color, but because of the way the eye works a mixture of red light and green light looks yellow to us.

Any color can be created by mixing the correct proportions of red, green, and blue light. This is the additive color system, with white (shades of gray) being equal red, green, and blue. This is the way television and computer screens work.

Colors can also be made by selectively filtering (subtracting) colors from white light. Cyan pigment (your blue above) subtracts red and yellow pigment subtracts blue, so only green is left. This is the subtractive color system. This is the way printed media show color.

As usual, wikipedia has a good article:
https://en.wikipedia.org/wiki/Color
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Old 02-11-2018, 03:38 PM   #218
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If you google color codes there are a lot of websites that will let you pick a color and the site tells you how much red, green and blue make it up. For example:

https://htmlcolorcodes.com/

As you move from blue to yellow you decrease the amount of blue but you have to be pretty far toward yellow before you don't have any blue, and even that's only true if the colors are very saturated.

If a manufacturer makes a reader with a green light option he's going to need a different way to market it.

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Old 02-11-2018, 03:53 PM   #219
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Originally Posted by shalym View Post
I was always taught that green is created by mixing yellow and blue together. Is that wrong?

Shari
Depends on if you are mixing light (additive) or reflecting light (subtractive). For additive, RBG is used, for subtractiive either RYB or CMY/CMYK are used.

See Wikipedia Additive Colour and Subtractive Colour for more information.

Last edited by DNSB; 02-20-2018 at 04:11 PM.
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Old 02-11-2018, 04:29 PM   #220
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Originally Posted by barryem View Post
If you google color codes there are a lot of websites that will let you pick a color and the site tells you how much red, green and blue make it up. For example:

https://htmlcolorcodes.com/

As you move from blue to yellow you decrease the amount of blue but you have to be pretty far toward yellow before you don't have any blue, and even that's only true if the colors are very saturated.

If a manufacturer makes a reader with a green light option he's going to need a different way to market it.

Barry
Saturated colors are not very common in nature, but LEDs are among the spectrally narrowest light sources around and LED is the cheapest and easiest light source for a hypothetical green light ereader. Using pure green illumination is not a technical or economic problem.

I'm not sure what you are trying to say about the ordering of the colors in
https://htmlcolorcodes.com/
or what that order or distance along it has to do with anything, but its definition of green is:
GREEN #008000 RGB(0, 128, 0)
which has no red and no blue. Green is well, green, as is the light from a green LED.
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Old 02-12-2018, 05:08 PM   #221
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I think you're right and that I was confused. Sorry.

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Old 02-12-2018, 10:27 PM   #222
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It was honest confusion, and color can be confusing.

Besides, there is overlap in cones response to light of various colors. But it turns out that red and green have a lot of overlap, not green and blue.

Anyway, I just did a search on green light interfering with sleep, and it turns out that green light was the control for the original Harvard study. So, even if green light interferes with sleep, it is much less than blue light.

https://www.health.harvard.edu/stayi...as-a-dark-side

So, a green lit reader would reduce sleep interference compared with the typical white lit reader. Not saying people would like a green lit reader or that anyone should make one for sale.
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Old 02-20-2018, 02:42 PM   #223
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To reduce sleep interference you need less interesting books. All too often on a work night I've ended up staying up most of the night because I couldn't put the book down. The color of the light is not nearly as much of a problem.
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Old 02-21-2018, 04:49 PM   #224
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Now to be truly original, how about a tablet/reader with a LCD or active OLED screen on one side and a e-ink screen on the other side.
There were the Entourage eDGe and Pocket eDGe.

https://en.wikipedia.org/wiki/Pocket_eDGe
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Old 02-21-2018, 09:46 PM   #225
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On a related note: Lately, maybe within the last two weeks or so, Walmart is starting to include Vudu digital movie cards similiar to the planned ebook cards. Have not looked too closely if the new cards can be exchanged for a credit. They are starting to train people in buying digital goods with physical cards. Plus we got now more self checkout terminals and handheld scanners to shop. Soon the only cashiers are going to be the customers.
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