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Additive and Subtractive Color Mixtures

Additive and Subtractive Color Mixtures.

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Additive and Subtractive Color Mixtures

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  1. Additive and Subtractive Color Mixtures Most objects we see consist of more than one color. Their colors are mixtures of wavelengths of light. Two kinds of color mixtures: additive and subtractive. Additive color mixture refers to mixing the three primary lights: red, blue, and green. When all three colors of light are added, we see white light.Subtractive color mixtures are colors that result from mixing pigments, paint, or dye. Certain wavelengths are removed (i.e., subtractive) when colors are mixed in this way. Primary colors for subtractive mixtures are magenta, yellow, and cyan.

  2. Demonstration of Complementary Afterimage

  3. Demonstration of Complementary Afterimage

  4. More color after-effects • http://www.michaelbach.de/ot/col_lilacChaser/index.html

  5. Top-down processing

  6. Contextual Effect

  7. Contextual effect

  8. An Example of Figure-Ground Ambiguity

  9. Perceptual ambiguity

  10. Different version of previous image

  11. Necker cube illusion • http://www.michaelbach.de/ot/sze_Necker/index.html • http://dogfeathers.com/java/necker.html

  12. Closure

  13. Subjective Contour

  14. Size constancy

  15. Monocular cues: Interposition

  16. Monocular cues: Linear perspective

  17. Binocular cues: Retinal disparity

  18. Binocular cues: Convergence

  19. Ponzo Illusion

  20. Deconstruct the Ponzo Illusion

  21. Without the distance cue of linear perspective, the bars now appear equal – which they are.

  22. In the Müller-Lyer illusion, two vertical line segments are equal in length, but the one with arrow feather endings appears to be longer • Line with arrow feather endings has the appearance of a corner that is receding away from you (corners where two walls meet in a room), while the line with arrowhead endings has the appearance of a corner that is jutting out toward you (corners where two sides of a building meet) • Thus, it is our past experience with corners that leads the brain to believe that the line with arrow feather endings is farther away

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