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colors: RGB versus primary colors - Adobe Photoshop Elements

I am learning and relearning a lot as I slowly move through Lynch's _Hidden Power of Photoshop Elements 2_, but there is a question that has come up that is not addressed in the book: If the three primary colors are red, blue, and yellow, while are color photographs separated into red, blue, and _green_ layers? Thanks for any guidance. Paul (Bullen)...

  1. #1

    Default colors: RGB versus primary colors

    I am learning and relearning a lot as I slowly move through Lynch's _Hidden Power of Photoshop Elements 2_, but there is a question that has come up that is not addressed in the book: If the three primary colors are red, blue, and yellow, while are color photographs separated into red, blue, and _green_ layers?
    Thanks for any guidance.

    Paul (Bullen)
    Paul_Bullen@adobeforums.com Guest

  2. #2

    Default Re: colors: RGB versus primary colors

    Paul, the primary colors for light are red, green and blue; if you shine
    three flashlights - one red, one green, and one blue - at a single spot, the
    spot will turn out to be white. I think that makes it additive color. As I
    recall, red, blue and yellow are the primary colors for painting, which is
    subtractive color (paint absorbs certain colors of light and allows others
    to reflect).

    Someone will come along with a much more cogent response, but if you
    remember that R+G+B=W for light, you're pretty much there...

    Chuck


    Chuck_Snyder@adobeforums.com Guest

  3. #3

    Default Re: colors: RGB versus primary colors

    You're right Chuck. Red, green, and blue are colors that combine to create white light. The absence of all three colors is black, which is why it's dark out at night. Cyan, magenta, and yellow, the three colors that are what your printer use, are the opposite and the more ink you have, the closer you get to black.
    However, primary colors, on the other hand, refer to the color spectrum. Red, blue, and yellow are all colors that are not made up of other colors, hence they are primary. For example, the secondary colors are made up of combinations of the primaries; red+blue=purple, red+yellow=orange, and blue+yellow=green. Purple, orange, and green are all secondary colors. Then, there are tertiary colors...
    Elena_Murphy@adobeforums.com Guest

  4. #4

    Default Re: colors: RGB versus primary colors

    Elena, I think we're both right, based on the link provided below:

    http://www.beer.org/~tpark/color.html



    Chuck_Snyder@adobeforums.com Guest

  5. #5

    Default Re: colors: RGB versus primary colors

    Elena and Chuck,

    Thanks to you both for a very "colorful" discussion. I will be better
    able to answer questions from some of my students in a Digital Imaging
    class that I teach.

    Kudos to you both.

    j

    --
    Using M2, Opera's revolutionary e-mail client: http://www.opera.com/m2/
    Dick_Smith@adobeforums.com Guest

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