We think you have liked this presentation. If you wish to download it, please recommend it to your friends in any social system. Share buttons are a little bit lower. Thank you!
Presentation is loading. Please wait.
Published byKalyn Axson
Modified about 1 year ago
Sensation and Perception - color.ppt © 2001 Dr. Laura Snodgrass, Ph.D.1 Color Perception The Physical and Psychological variables Grassman’s Laws of color mixing Additive vs. Subtractive color mixing Color facts and findings Physiological findings Balance Theory
Sensation and Perception - color.ppt © 2001 Dr. Laura Snodgrass, Ph.D.2 3 Physical And Psychological Variables PHYSICAL –wavelength –intensity –purity PERCEPTUAL –hue –brightness –saturation
Sensation and Perception - color.ppt © 2001 Dr. Laura Snodgrass, Ph.D.3 Double Cone Color Solid GRAPH of the 3 physical variables Some colors are not on the graph: extra-spectral purple non-spectral - gold, silver, bronze, brown Every point on the graph represents a color
Sensation and Perception - color.ppt © 2001 Dr. Laura Snodgrass, Ph.D.4 Grassman’s Laws of Additive Color Mixture A normal person can match any hue with a combo of 3 non-complementary colors Complementaries –equal mix produces gray –unequal produces de-saturation of the dominant color Non - complementaries –de-saturated intermediate hue Metamers –appear the same, but composed of different wavelengths
Sensation and Perception - color.ppt © 2001 Dr. Laura Snodgrass, Ph.D.5 Additive vs. Subtractive Color Mixing Additive color mixing is a mix of lights –stage lighting –pointillism (paintings) Subtractive color mixing is usually from reflected light –most of our color experience is reflected light
Sensation and Perception - color.ppt © 2001 Dr. Laura Snodgrass, Ph.D.6 Additive vs. Subtractive Color Mixing Subtractive Color Mix The paint absorbs or subtracts out wavelengths and the color you see if the wavelengths that were reflected back to you (not absorbed) Additive mixture The wavelengths are added together so the final color you see is the sum of the wavelengths
Sensation and Perception - color.ppt © 2001 Dr. Laura Snodgrass, Ph.D.7 Color Facts Grassman’s laws, esp. 3 colors can make any hue Lack of reddish-green or bluish-yellow 3 cone types 4 primary colors Complementary afterimages Simultaneous contrast Color map of the retina Color blindness
Sensation and Perception - color.ppt © 2001 Dr. Laura Snodgrass, Ph.D.8 Color Blindness Normal color vision - 3D trichromats Dichromats - 2D vision (2% males) –Protanopes see blue and yellow (no red or green) blind to deep red light –Deuteranopes see blue and yellow but can see all wavelengths –Tritanope see red and green Monochromat - hue blind
Sensation and Perception - color.ppt © 2001 Dr. Laura Snodgrass, Ph.D.9 Physiological Findings Wald - measures spectral sensitivity of cones –three cone types short, medium, and long wavelength detectors De Valois –opponent process cells in LGN –excitatory to one color and inhibitory to another R+G-; G+R-; B+Y-; Y+B-
Sensation and Perception - color.ppt © 2001 Dr. Laura Snodgrass, Ph.D.10 Hurvich and Jameson’s Balance Theory Retina –three cone types (short, medium, and long wavelength detectors) LGN –opponent process cells Cortex –“balances” that produce all spectral colors by balancing inhibition and excitation
Sensation and Perception - color.ppt © 2001 Dr. Laura Snodgrass, Ph.D.11 Hurvich and Jameson’s Balance Theory Note the pattern of excitatory and inhibitory connections between the cones in the retina and the opponent process cells in LGN
Sensation and Perception - color.ppt © 2001 Dr. Laura Snodgrass, Ph.D.12 Balance Theory Color is determined by the pattern of responses in the three different cone types.
Sensation and Perception - color.ppt © 2001 Dr. Laura Snodgrass, Ph.D.13 Hurvich and Jameson’s Balance Theory Balances in cortex are needed to account for colors beyond four primaries Blue Yellow Green Red E.g. Yellow & Red = Orange Blue & Red = Purple SM + LMS
COLOR PERCEPTION Physical and Psychological Properties Theories – Trichromatic Theory – Opponent Process Theory Color Deficiencies Color and Lightness.
Chapter 9: Perceiving Color. Figure 9-1 p200 Figure 9-2 p201.
Chapter 9: Color Vision. Overview of Questions How do we perceive 200 different colors with only three cones? What does someone who is “color-blind” see?
1 THEORIES OF COLOR VISION Prof. Vasudev Anand Rao.
Color. What is ‘Color’ Color is a fundamental attribute of human visual perception. By fundamental we mean that it is so unique that its meaning cannot.
Chapter 9: Perceiving Color. Figure 9-1 p200 Color and Wavelength - continued Colors of objects are determined by the wavelengths that are reflected.
Wavelength and Color Recall that light is electromagnetic radiation.
Color Vision Our visual system interprets differences in the wavelength of light as color Rods are color blind, but with the cones we can see different.
Color Vision. Wavelength properties: ● Hue: psychological reaction to different wavelengths of light. (Basically the same thing as color). ● Different.
Chapter 7: Color Vision How do we perceive color?.
Read Land article for Thursday Test starts Wednesday of next week!!!!
How do we see color? There is only one type of rod. It can only tell the intensity of the light, not its color. Because the cones can differentiate colors,
Read article by Land for Thursday Article by Anne Treisman coming up in about two weeks.
Chapter 7: Color perception Color is an important source of information independent of luminance (which we discussed extensively in Chapter 5). Color is.
Chapter 9: Perceiving Color. What Are Some Functions of Color Vision? Color signals help us classify and identify objects. Color facilitates perceptual.
The Visual System: Color Vision Lesson 18. The Trichromatic Theory n Young-Helmholtz (1802) n 3 types of color receptors l Cones n Differential sensitivity.
Colour Vision I The retinal basis of colour vision and the inherited colour vision deficiencies Prof. Kathy T. Mullen McGill Vision Research (H4.14) Dept.
COLOR VISION Psychological dimensions: Hue = basic color; determined by dominant wavelength in mixture Saturation = purity of color; determined by a combination.
Chapter 7: Perceiving Color. Overview of Questions Why do we perceive blue dots when a yellow flash bulb goes off? What does someone who is “color-blind”
Midterm 2 March 9 th and 10 th Review Session Monday 7pm in this room (probably)
1 Computational Vision CSCI 363, Fall 2012 Lecture 33 Color.
1 Perception and VR MONT 104S, Fall 2008 Lecture 7 Seeing Color.
Opponent Processes Lateral geniculate nucleus (LGN) has cells that are maximally stimulated by spots of light Visual pathway stops in LGN on the way from.
Color Perception How your eye/brain processes colors.
Vision. The Eye Source: Wikimedia commons Schematic diagram of the vertebrate eye.
Serial vs. Parallel Processing Serial Processing – Process items one after another – Conscious processing Parallel processing – Simultaneously processing.
Anthony J Greene1 COLOR VISION I The Spectrum II Trichromatic Vision –Cones 1.Additive Mixing 2.Subtractive Mixing III Color Opponency –Complimentary Colors.
Psychology 100:12 Chapter 5 Sensation & Perception Part III.
Perception Chapter 7: Color Vision Color Vision: The reason why humans perceive different colors in the environment is because of the manner in which the.
Chapter 9: Perceiving Color. Overview of Questions Why do we perceive blue dots when a yellow flash bulb goes off? What does someone who is “color-blind”
Homework Set 8: Due Monday, Nov. 18 From Chapter 9: P10, P22, P26, P30, PH3, From Chapter 10: P4, P5, P9.
Ch 71 Sensation & Perception Ch. 7: Perceiving Color © Takashi Yamauchi (Dept. of Psychology, Texas A&M University) Main topics Trichromatic theory Opponent.
COLOR THEORYCOLOR THEORY. Pigment vs. Light pigments - "subtractive." Red, blue and yellow can create all the colors of the color wheel. (paint, pigments)
Sensation Vision The Eye Theories Hearing The Ear Theories Other Senses Smell Taste Pain Gestalt Principles Perceptual Constancies Perception Basic Principles.
Color Theory & the Color Wheel. A Color Wheel How do we “see” color?
Light and Color. An objects color depends on the wavelength of light it reflects and that our eyes detect. White light is a blend of all colors. When.
Ch 91 Sensation & Perception Ch. 9: Perceiving Color © Takashi Yamauchi (Dept. of Psychology, Texas A&M University) Main topics Functions of color Trichromatic.
Color Theory “color is a visual sensation perceived by the eye and the mind due to the activity and vibration of light”
Wavelength 1 produces a response of size X. Wavelength 2 produces a response of size X.
Do Now Try to label the diagram of the eye Use your textbook and the terms on the right to help you Optic nerve Pupil Lens Retina Vitreous Iris Cornea.
Sang Wook Hong. Segmenting objects from their backgrounds Learning about the properties of objects Signaling Color coding.
Color Vision: Sensing a Colorful World Psychological experience of vision Trichromatic Theory Opponent-Process Theory.
Elements of Design: Color Claudia Jacques de Moraes Cardoso-Fleck 2D Design – Art 112.
Color Theory And Photography. Color Wheel
- is the response of vision to the wave-length of light reflected from the surface. - is the response of vision to the wave-length of light reflected from.
Color. Light Spectrum Visible light comes in different wavelengths (or frequencies). Each wavelength represents a color. Red (~ nm), Green(~ nm),
CS-321 Dr. Mark L. Hornick 1 Color Perception. CS-321 Dr. Mark L. Hornick 2 Color Perception.
© 2017 SlidePlayer.com Inc. All rights reserved.