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How do I calculate pixels number

  1. Aug 5, 2010 #1
    Adults need 2.5" between Eyes, but this is too far for kids eyes.
    Adults = 2.5" = 52 Pixels difference = left eye 26 pixels, Right eye 26 pixels
    Kids = 2.0" = ? Pixels = Left eye ? Pixels = Right eye ? Pixels (less than 26 each eye is all I know)

    This is to calculate the parallax in 3D video. I need to know how much pixels kids use, and all I know is it's less than the 52 pixels for Adults eyes.
     
    Last edited: Aug 5, 2010
  2. jcsd
  3. Aug 5, 2010 #2

    Mark44

    Staff: Mentor

    I have no idea what you're trying to say here.
    ??
     
  4. Aug 5, 2010 #3
    So 2.5" is equivalent to 52 Pixels, or 52 pixels = 2.5" inches difference.
    52 Pixels = 26 Pixels * 2 (26 pixels each eye)

    I need to know how many pixels if the inches used is 2.0 inches difference, not 2.5 inches.
    I think I need to use division but don't know how.
     
  5. Aug 5, 2010 #4

    Mark44

    Staff: Mentor

    Use a proportion. 2.5/2.0 = 52/x

    What kind of a screen is this you're working with? ~20 pixels/inch seems very low resolution to me.
     
  6. Aug 5, 2010 #5
    It's not resolution, it's for cropping to make parallax either negative or positive.

    Maybe this is the way?

    2.5 / 2.0 = 1.25
    52*1.25 =65
    65 - 52 = 13
    52 - 13 = 39
    38 / 2 = 19 pixels difference each eye.

    Thank you Mark44!
     
    Last edited: Aug 5, 2010
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