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# Color
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Color (also *colour*) is the perceived visual attribute of light that's associated with its [wavelength](wavelength.md); for example [red](red.md), [blue](blue.md) and [yellow](yellow.md) are colors. There is a hugely deep *color theory* concerned with the concept of a color.
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TODO
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## What Is Color?
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This is actually a non-trivial question, or rather there exist many varying definitions of it and furthermore it is a matter of subjective experience, perception of colors may differ between people. When asking what color really is, consider the following:
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- Are non-primary colors true colors, or just mixtures of the primary colors? Red, green and blue are the three primary colors, the ones we can mix all other colors from. Many will say yes, non-primary colors are colors. But hold on.
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- Are non-spectral colors colors or just mixtures of spectral colors? Spectral colors are the colors with a single wavelength (e.g. red, orange or violet), other colors (like pink) are just mixtures of these. Again, probably yes.
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- Is [saturation](saturation.md) part of color, or a separate attribute? I.e. are e.g. green and greenish gray different colors, or same colors with different saturation? Now it depends.
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- Is [black](black.md) a color, or rather a lack of a color? E.g. in computers it is usually treated just as another color, but [real world](irl.md) black is really the absence of any light.
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- Is [white](white.md) a color? If we are using a subtractive color model, the argument is the same as for black (white paper is really just lack of any color on it).
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- Is e.g. gold a color? Or just yellow with a lot of [specular reflection](specular.md)? In real world many things may be called to have a gold color, but in computer graphics we would likely separate the color from the light reflective attribute (such as metalicity).
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- Is transparent a color?
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- Is intensity part of color (especially in context of e.g. [HDR](hdr.md))? For example we might say both [Sun](sun.md) and paper are white, but still Sun's color is much "stronger" -- is it therefore a "whiter white" than that of a paper?
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- Are colors not perceivable by average human colors? Many animals see colors we can't see (e.g. those in [infrared](infrared.md) spectrum), but there are also rare cases of humans (so called tetrachromats) who see many more colors than usual thanks to a mutation.
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- Are [impossible colors](impossible_color.md) colors? Interestingly there exist colors perceivable by average humans which however cannot naturally be seen due to "physics" -- they can however be seen with "eye [hacks](hacking.md)". Do we count these too?
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- ...
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# Ronja
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{ I was informed about this by a friend over email <3 ~drummyfish }
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Ronja (reasonable optical near joint access) is a [free/open](foss.md) [KISS](kiss.md) device for wireless connection of two devices using light (i.e. optical communication) and the [ethernet](ethernet.md) protocol; it can be [made at home](diy.md), doesn't require any [MCUs](mcu.md) and as such can be considered a [LRS](lrs.md)/[suckless](suckless.md) alternative to traditional [WiFi](wifi.md) [routers](router.md) that are de-facto owned and controlled by [corporations](corporation.md). It works full [duplex](duplex.md) up to the distance of 1400 meters with a speed of 10 Mbps, which is pretty amazing. One can also imagine Ronja as a kind of ethernet cable, just implemented with light instead of electricity. The design is released under [GFDL](gfdl.md). The project website is at http://ronja.twibright.com/.
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There are many advantages in Ronja -- besides the mentioned KISS design and all its implications (freedom, repairability, cheap price, compatibility, ...), Ronja works with just an ethernet card, offers a stable and constant transmission speed with very low latency, can be potentially harder to spy on: besides visible light the transmission can also use infrared spectrum and narrow direction of transmission, as opposed to radiating to all directions, also the fast flickering is unnoticable by human or even normal cameras, therefore Ronja transmission is expensive to detect. Also note that some kind of encryption can be used above Ronja, if one so desires.
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## See Also
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- [li-fi](li_fi.md)
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