1 / 37

COLOR Perception

COLOR Perception. Sam Francis, Three Colors. The Three Color Systems:. Additive (light-based), also known as RGB color Subtractive (pigment based) Process (Printing-based) CMYK color . Traditional, Pigment-based Primaries.

kellan
Download Presentation

COLOR Perception

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 Sam Francis, Three Colors

  2. The Three Color Systems: • Additive (light-based), also known as RGB color • Subtractive (pigment based) • Process (Printing-based) CMYK color

  3. Traditional, Pigment-based Primaries

  4. Primaries and Secondaries in a light-based system, where Red, Green, and Blue Make magenta, yellow, and cyan, and finally, white.

  5. Primary colors in the CMYK (printing and photo) system

  6. We see color when light wavelengths are interrupted by matter. In the case of a green leaf, all colors in sunlight are absorbed into the leaf except for green, which is reflected toward our eyes. If all wavelengths are absorbed we see black. If all wavelengths are reflected we see white.

  7. Basic Diagram of the human eye

  8. Rods: perceive value and movement only. They allow us to perceive forms (but not colors!) in all light situations, including dim light. Cones: perceive color. They require a brighter lighting situation to function. This is why we don’t see colors as well at night. This is also why squinting can help to determine what color is lower in value---squinting allows less light to pass through our eyes, limiting the effects of the cones, and our ability to read color. Only rods are working, so we are able to focus on value better. We have 100million rods and 6million cones.

  9. Two theories of how colors are perceived. • Trichromatic theory: states that there are three different kinds of cones, one for red, one for green, and one for blue-violet (this roughly corresponds to the primaries in the additive color system).

  10. We see all colors through variations in the amounts of these cones that are stimulated. For example, when perceiving yellow, the red and green cones are activated • Remember, in the additive color system, red and green mix to create yellow.

  11. Theory two • Opponent-process theory: according to this theory, colors are discerned through cone pairs of opposing colors. • Pairs of cones will perceive red and green OR Blue-violet and Yellow. • In each pairing, only one color can be seen at a time and the other is inhibited.

  12. After-Images • This theory may explain the phenomena of After-Images, where, if you focus on an area of saturated color for a long time and then move your eyes, you will briefly see the complement (according the the subtractive color wheel) of that color. • The theory suggests that when a cone is fatigued from focusing on a strong, dominant color, it’s opposite is no longer suppressed, and is spontaneously generated.

  13. AFTER IMAGE: when the signaling mechanism for one color is fatigued, its complimentary is no longer inhibited.

  14. After Image is also known as ‘Successive Contrast’

  15. FACTORS INFLUENCING COLOR PERCEPTION: • Amount and quality of lighting on surfaces • Visual health/condition of color blindness or other color abnormalities • The surface of the object: shiny, matte, textured • The amount of a color • Color relationships: how color is affected by its surroundings

  16. Abnormal color perception/perception deficiencies

  17. Color-blindness occurs in about 7% of men and .04 % of women

  18. Individuals will lack a type of cone and thus be unable to perceive the color associated with that cone

  19. The Ishihara Color test is a tool used to diagnose color blindness

  20. http://prometheus.med.utah.edu/~bwjones/2013/12/color-blindness-what-does-it-look-like/http://prometheus.med.utah.edu/~bwjones/2013/12/color-blindness-what-does-it-look-like/

  21. Synesthesia is a perception abnormality where people respond to the environment by combining senses. Shapes may have taste, sounds or scents may trigger color.These colors are actually perceived in response to sound, smells, etc.

  22. Grapheme Synesthesia • Letters and numbers have inherent color associations

  23. Chromesthesia • Sounds or musical tones trigger shapes and colors that fade once the sound ends

  24. Wassily Kandinsky, 20thc Russian painter and synesthete

  25. The surface of the object: shiny black satin vs. matte velvet.

  26. The amount of a color, colors typically seem more intense/vibrant in smaller amounts

  27. The environment surrounding a colorThe center stripe is actually one single value.

  28. Different temperatures of light will change our perception of colors

  29. CLAUDE MONET 3 VIEWS OF ROUEN CATHEDRALMonet famously painted over 30 versions of this cathedral, exploring how light at different times of day changed his perception of the colors. Early morning midday sunset

  30. Metamerism • The capacity of colors to change under different lighting situations

  31. Color Constancy • The idea that we tend to perceive colors as unchanging, because of our visual memory of objects. Our brains are able to compensate for color changes that occur due to changing light situations.

  32. LOCAL COLOR:the general color of an object

More Related