02-09-2018, 01:36 PM | #211 |
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02-10-2018, 10:20 AM | #212 |
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02-10-2018, 08:42 PM | #213 | |
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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. Barry |
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02-11-2018, 12:31 AM | #214 |
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02-11-2018, 08:59 AM | #215 |
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02-11-2018, 09:24 AM | #216 |
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02-11-2018, 12:09 PM | #217 | |
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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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02-11-2018, 02:38 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. Barry |
02-11-2018, 02:53 PM | #219 | |
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See Wikipedia Additive Colour and Subtractive Colour for more information. Last edited by DNSB; 02-20-2018 at 03:11 PM. |
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02-11-2018, 03:29 PM | #220 | |
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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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02-12-2018, 04:08 PM | #221 |
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I think you're right and that I was confused. Sorry.
Barry |
02-12-2018, 09:27 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. |
02-20-2018, 01:42 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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02-21-2018, 03:49 PM | #224 | |
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https://en.wikipedia.org/wiki/Pocket_eDGe |
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02-21-2018, 08:46 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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