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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. comex‏ @comex 25 Mar 2018
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      Apparently there is no such thing as pure blue paint, from an RGB perspective. How odd! They all have high green values. (from http://www.easyrgb.com/en/match.php )pic.twitter.com/6q6AQ1W8Fp

      4 replies 3 retweets 21 likes
    2. badidea  🪐‏ @0xabad1dea 25 Mar 2018
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      Replying to @comex

      Well, your RGB true blue would be pretty eye searing across a whole wall…

      1 reply 0 retweets 2 likes
    3. comex‏ @comex 25 Mar 2018
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      Replying to @0xabad1dea

      I don’t actually want to paint a wall, even though that’s a house paint brand… I’d be fine with *any* kind of paint if it’s the right color.

      1 reply 0 retweets 1 like
    4. badidea  🪐‏ @0xabad1dea 25 Mar 2018
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      Replying to @comex

      You probably want model paint then, it comes in lots of bright colors, albeit in small doses

      1 reply 0 retweets 0 likes
    5. comex‏ @comex 25 Mar 2018
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      Replying to @0xabad1dea

      Hmm, thanks for the suggestion… I don’t know much about paint, but it seems to be hard to find actual color values online in a lot of cases

      1 reply 0 retweets 0 likes
    6. Hector Martin‏ @marcan42 25 Mar 2018
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      Replying to @comex @0xabad1dea

      Colorimetry is hard. The mapping depends on way too many factors (e.g. what light you use), even if you assume sRGB on the RGB side. An unqualified RGB tuple is almost meaningless.

      1 reply 0 retweets 2 likes
    7. comex‏ @comex 25 Mar 2018
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      Replying to @marcan42 @0xabad1dea

      Colorimetry is hard, sure, but the difference I’m talking about is large enough that it doesn’t really matter.

      1 reply 0 retweets 0 likes
    8. Hector Martin‏ @marcan42 25 Mar 2018
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      Replying to @comex @0xabad1dea

      The reason why there's no paint in pure sRGB corner colors is probably that it'd be too dark in normal lighting. If you only reflect a very narrow band of wavelengths as required, you're throwing away most of the spectrum. Things are always duller in reflective media.

      1 reply 0 retweets 5 likes
      Hector Martin‏ @marcan42 25 Mar 2018
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      Replying to @marcan42 @comex @0xabad1dea

      There's probably a way to do the math too. Assuming a D65 illuminant, there should be an optimal reflective response that visually matches an sRGB blue primary chromaticity, and then you can calculate its brightness relative to 100% white. I'm sure it's less than #00f/#fff.

      10:42 PM - 25 Mar 2018
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        1. comex‏ @comex 25 Mar 2018
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          Replying to @marcan42 @0xabad1dea

          More like a curve of visual closeness vs. brightness, no?

          1 reply 0 retweets 0 likes
        2. Hector Martin‏ @marcan42 25 Mar 2018
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          Replying to @comex @0xabad1dea

          Well, you could compute a 3D space of the optimal spectra representing a chromaticity from 100% sRGB blue to white, and then pick the one that matches the brightness of 100%B in sRGB (which will be washed out)

          1 reply 0 retweets 0 likes
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