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Thread: reproduction PDP 8e toggle switches?

  1. #61
    Join Date
    Jul 2014
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    Rhode Island
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    I just received some custom made DEC white spray paint from MyPerfectColor.com to repaint PDP-8/e programmer's panels. $63 for three cans including shipping. I haven't tried it yet.

    Hedrix Fast Dry Acrylic Enamel Spray Paint Match of Munsell N 9.5/ (Neutral Value Scale)

    I took the paint code from Vince's documents.
    Member of the Rhode Island Computer Museum
    http://www.ricomputermuseum.org

  2. #62

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    Be aware that for a given set of RGB values, the actual color rendered by monitor A is not necessarily going to be the same as the color rendered on monitor B. Ditto for printer A vs printer B. But, thankfully, others, like in the photography and fashion industries, have already run down that rabbit.

    https://photographylife.com/how-to-c...e-your-monitor

    https://www.lifewire.com/calibrate-your-printer-1073954
    "It's all bits on the bus, Cowboy! It's all bits on the bus!" -- Tom Beck, #1ESS Instructor, Southern Bell Opa Locka Training Center

  3. #63

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    Quote Originally Posted by DDS View Post
    Be aware that for a given set of RGB values, ...
    There is a sense in which neither were/are the paint colors. Even a hue specification like "24.125" is only specifying the hue with an effective resolution of a couple hundred colors. (The space is carved into 24 slices, with a resolution of 1/8 in each one.) It was considered "good enough" at the time, and mostly gave a shared vocabulary for talking about color.

    Unfortunately, the eye is scary good at telling close colors apart when they are held next to each other. (Fortunately, we are terrible at telling one shade of orange from another if we have to look at them one after the other.) So it's way easier to get acceptable "PDP-8/E colors" than to get something to match our existing machines.

    Vince

  4. #64

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    I finished some major code cleanup today on these:
    http://svn.so-much-stuff.com/svn/tru...repair/dec-std
    http://svn.so-much-stuff.com/svn/tru...r/dec-std.html

    This replaces the Munsell color code that I had with table lookups. There's just not an easy algorithm that approximates the scheme well, as it's apparently all tweaked by artists to look right.

    It also substantially cleans up the CHM code I had -- that scheme is fairly regular, but I rewrote the bits that compute the white and black content to perform correctly as I understand Ostwald's scheme.

    I added some pretty tables at the front, which hopefully suggest that things are working.

    Many of the colors in the DEC table look more like CHD's page now .

    Vince

  5. #65

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    Is the DEC spray paint from MyPerfectColor for the aluminium frame around the periphery of the 8/E programmer's panel?

  6. #66
    Join Date
    Jul 2014
    Location
    Rhode Island
    Posts
    1,375

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    Quote Originally Posted by firedome View Post
    Is the DEC spray paint from MyPerfectColor for the aluminium frame around the periphery of the 8/E programmer's panel?
    It is for the frame around an 8/a programmer's panel. Hopefully it is the right color.
    Member of the Rhode Island Computer Museum
    http://www.ricomputermuseum.org

  7. #67

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    One other thing I found online that may be helpful:
    https://www.easyrgb.com/en/match.php
    Which allows you to enter sRGB values, and match them against a variety of modern paint lines, including some RAL and Pantone lines.

    Oh, and here's the Munsell Renotation Data, if anyone wants that:
    https://www.rit.edu/cos/colorscience...renotation.php

    Vince

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