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What primary color scheme should SoylentNews have? | Log In/Create an Account | Top | 162 comments | Search Discussion
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  • (Score: 4, Interesting) by TheLink on Saturday March 01 2014, @10:30AM

    by TheLink (332) on Saturday March 01 2014, @10:30AM (#9045) Journal

    With emitted light the primary colours are additive, red, green, blue.

    Only for conventionally trichomatic humans ;). There are humans who would need four distinct primary colours for their full colour gamut:
    http://www.theguardian.com/science/2001/feb/01/tec hnology2 [theguardian.com]
    https://www.ncbi.nlm.nih.gov/pubmed/8351822 [nih.gov]
    http://neuroblog.stanford.edu/?p=5181 [stanford.edu]

    I wonder if watching TV for them would be like us watching a TV with a missing primary colour.

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  • (Score: 2) by maxwell demon on Sunday March 02 2014, @10:18AM

    by maxwell demon (1608) on Sunday March 02 2014, @10:18AM (#9489) Journal

    Actually, even for "normal" people, three colours are not really enough to mix all existing colours. Especially the spectral colours cannot be mixed out of other colours.

    With three appropriately chosen colours you can, however, get a large part of all colours (and a good approximation for the rest), and it happens that the best choices contain one red, one green and one blue colour — although the standard choices like sRGB can be far from optimal as can be seen e.g. here. [wikipedia.org]

    Note that the display of the colours outside the sRGB triangle in the image is necessarily wrong. But then, the choices of base colours are affected by other considerations (for example, from the colours alone, the optimal choice for red and blue would be a spectral colour very close to the border of the visible spectrum, but there our eye's sensitivity is low, so you'd probably need ridiculously — if not dangerously — high intensities; also you're limited in what colours you can actually produce with reasonable effort, which I guess is the reason why the green colour of sRGB is so far away from the optimum which would be monochromatic light with a wavelength near to 520 nm).

    --
    The Tao of math: The numbers you can count are not the real numbers.