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Miss him (infosec.pub)

submitted 21 hours ago by themaninblack@lemmy.world to c/memes@lemmy.world

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[–] AnarchoEngineer@lemmy.dbzer0.com 10 points 13 hours ago* (last edited 13 hours ago) (1 children)

The real fascinating thing is that Impossible Colors exist, which means it’s kind of impossible to actually represent all colors or impossible to precisely represent them.

Imo it seems colors are relative to how our brain and eyes are adapting to their current field of view, meaning the color you experience is not fully dependent on the light an object actually reflects nor the activation of your rods and cones but is dependent on the way your brain processes those signals with each other. Ergo, you can’t actually represent all colors precisely unless you can control every environmental variable like the color of every object in someone’s field of view and where someone’s eyes have been looking previously etc.

[–] Brosplosion@lemmy.zip 3 points 6 hours ago (1 children)

Pedantic, but anything measurable and continuous is impossible to precisely represent. π/e meters for example.

[–] TonyTonyChopper@mander.xyz 2 points 5 hours ago (1 children)

If you want to be even more pedantic you could say no metre stick is exactly 1 metre long according to the current definition of a metre. If you want to be scientific then all of them are within some reasonable range like 1.000 ± 0.002 m. If you want to be historic then at one time there was a perfect metre stick

In 1799, the metre was redefined in terms of a prototype metre bar. The bar used was changed in 1889, and in 1960 the metre was redefined in terms of a certain number of wavelengths of a certain emission line of krypton-86. The current definition was adopted in 1983 and modified slightly in 2002 to clarify that the metre is a measure of proper length. From 1983 until 2019, the metre was formally defined as the length of the path travelled by light in vacuum in 1/299792458⁠ of a second.

[–] Live_your_lives@lemmy.world 1 points 5 hours ago (1 children)

Wait, what changed in 2019?

[–] TonyTonyChopper@mander.xyz 1 points 30 minutes ago

After the 2019 revision of the SI, this definition [of the metre] was rephrased to include the definition of a second in terms of the caesium frequency ΔνCs.

https://en.wikipedia.org/wiki/Metre