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CYM, RBG?

Discussion in 'Lighting and Electrics' started by kingfisher1, Nov 6, 2005.

  1. kingfisher1

    kingfisher1 Active Member

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    Okay, i have been taught since first grade that red, blue and yellow are the primary colors.

    Now, with my introduction into the world of lighting i have been introduced to CYM and RBG. my question is which are the primary colors of light, and why does blue yellow and red light not mix in the same way that paint does. Is it a waveleghnth thing?
     
  2. soundlight

    soundlight Well-Known Member

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    When you use paint, it reflects the colors of light that you are using, and all others are absorbed in to the material. With light, you are actually using colored light, and that mixes things up. Red, Blue, and GREEN are the primary colors of light. Cyan, Magenta, and Yellow are the secondary colors of light. When you mix blue and green light, you get cyan; red and blue, magenta; red and green, yellow. The hardest color to make with light is yellow. While all of the primary colors of paint can be mixed together to make muddy mess, the primary colors of light can be mixed together to make white.

    Physics lesson time:
    So, when you paint, and you mix colors, and you reflect the colors of light that you paint (as I have already said). A lighting gel takes out all of the colors except the specific color of the gel. Then, when you mix the colors of the different gels, both colors of light are reflected in to your eye, activating different cones in you eye. This creates one color of the nerve signal sent out of you eye. The reason that this isn't the same as paint is that with paint, you are actually mixing the pigments together to reflect one color of light.

    The light mixing color wheel:
    http://upload.wikimedia.org/wikiped...ColorMixing.png/145px-AdditiveColorMixing.png

    Experiment with primary and secondary color mixing here:
    http://www.wackerart.de/mixer.html
     
  3. soundlight

    soundlight Well-Known Member

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    oh yeah...

    red, green and blue are the primary colors of light

    cyan, magenta, and yellow are the primary colors of pigment (like your printer)

    red, blue, and yellow are the primary colors of paint

    so there's the primary colors of everything.
     
  4. kingfisher1

    kingfisher1 Active Member

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    thanks
    i recently got to play with a cyc, and i though about doing RBG but the last time i saw that tried the colors looked really bad on the flesh tones. in hindsight i realize that that doesn't matter the slightest bit on a cyc (it was a long week ok!) but instead i use red yellow and blue,
    this limited my color secletion but since the collors didn't mix to well anway i did get a really nice effect, kind of clown looking....which worked out perfect for the show i was doing.
     

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