1 / 11

Color Perception Mechanisms

Color Perception Mechanisms. S. I. L. Relative response. 400. 460. 490. 500. 530. 600. 650. 700. Wavelength (nm). Blue. Cyan. Green. Red. Color Perception. Trichromats

jamesawilson
Download Presentation

Color Perception Mechanisms

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Color Perception Mechanisms

  2. S I L Relative response 400 460 490 500 530 600 650 700 Wavelength (nm) Blue Cyan Green Red Color Perception • Trichromats • Humans have three cones that correspond to three ranges of the visible light in the areas of red, green, and blue light.

  3. Normal Vision Viewer requires 3 basic colors to match another color. 91% Males ~ 99% Females Anomalous Trichromacy Also requires 3 basic colors to match another color, but the ratios of those three basic colors differ from a person with normal vision. ~ 6% Males Human Color Vision Deficiencies

  4. Monochromacy Requires one color to match any other color Two types: Cone monochromats: Only one type of cone (very small % of population) Rod monochromats: Only the rods respond (.003% males) Dichromacy Requires two colors to match any other color; 8-10% Caucasion males Four types: Protanopes: No L cones (1% males) Deuteranopes: No I cones (1% males) Tritanopes: No S cones (very small % pop.) Tetartanopes: Lack chromatic channel (RG or YB, small %) Human Color Vision Deficiencies

  5. Human Color Vision Deficiencies

  6. Negative Afterimages A viewer stares at an image for a period of time. The cones become desensitized. Upon looking at a plain white surface, the viewer perceives the previous image with complementary colors. Temporal Perception

  7. Positive Afterimages - Persistence of Vision An intense flash of light allows a viewer to see a scene. When the light goes out the signal from the cones persist. The viewer still perceives the image. Temporal Perception

  8. Real Movement An object physically moves. Induced Movement The background moves behind an object causing the perception that the object moved. Motion Perception

  9. Stroboscopic Movement Quick, sequential flashes of light / images that imply motion. e.g. television, film, monitor Autokinetic Movement A still spot of light appears to move in an unlit background. e.g. star in the night sky Motion Perception

  10. Waterfall Illusion After staring at water falling, look at a still object, and it will appear to move upward. Spiral Aftereffect After staring at a rotating spiral: a still spiral appears to move in the opposite direction. an object will appear to deform in the spiral motion opposite that initially observed. Aftereffects of Movement

  11. Perception of Causality One event is seen after another, thus it may be interpreted that the 1st event caused the 2nd. Personification Human / animal characteristics given to inanimate objects. Perception of Location Object 1 is seen going behind object 2, thus causing the viewer to extrapolate the location of object 1. Linking Successive Shots e.g. television, film Consequences of Movement

More Related