Color Vision

• Travels in straight line with approximate speed of 300,000 km/s (in a vacuum)


  Light
• Speed of light in vacuum

  299,792,458 m/s or 300,000,000 m/s or 300,000 km/s
• Longest wavelength and lowest frequency

  RED
• Shortest wavelength and highest frequency

  VIOLET
• Made of mass-less particles

  PHOTONS
• Electrical fields traveling through space

  PHOTONS
• Crest to crest or trough to trough, measured in meters

  Wavelength
• Height of each crest or depth of each trough

  AMPLITUDE
• Number of wavelength within a period of time, measured in cycle per second

  FREQUENCY
• Measured in electron volts

  ENERGY
• Narrow Portion within the electromagnetic spectrum that can be seen by the human eye

  Visible Spectrum
• Identified the ROYGBIV


  NEWTON
• Documented Newton's discoveries from his experiments passing light through a prism

  Opticks
• aspect of things that is caused by different qualities of the light reflected or emitted by an object definable by the observer in terms of: hue, lightness and saturation.

  Colors
• That characteristic of light by which an individual is made aware of the objects through the receptors of the eye, definable by the lobserver in terms of: wavelength, luminance and purity

  Colors
• Observer will define then colors in terms of what; 3 terms

  Wavelength, Luminance, & Purity
• Properties of Colors under Chromaticity

  Hue

  Brightness / Luminance

  Saturation

  Temperature
• familiar color's name or family and directly linked to the wavelength

  Hue
• Apparent intensity of color

  Brightness / Luminance
• The darkness (shade) or lightness (tint) of a color 0% lightness means?

  Black
• In terms of brightness, as the intensity increases, hues will appear what?

  Yellow-white
• In terms of Brightness, as the intensity decreases, all hues will

  Appear ACHROMATIC
• Purity of a color, dilution of hue by white

  Saturation or CHROMA
• 0% of saturation means

  BLACK
• Physics of the object relative to the environment - the spectrum of the incident light, reflectance properties (material and its physical chemical state, the surface roughness, end geometric circumstances light angle of incidence) of the surface.

  Color of objects
• Characteristics of the perceiving eye

  and personal contextual cues

  Color of objects
• ability to adjust to changes in illumination in order to preserve the appearance of object colors

  Chromatic Adaption
• ability to perceive colors as relatively constant over varying illuminations

  Personal Context Cues
• Ability to discriminate various wavelengths independent of light intensity or the ability to discriminate among stimuli on the basis of hue, independent of brightness or any other cue

  Color Vision
• It uses the effective energy of light and the properties of light to create color

  Color Vision
• Used to determine the location and shapes of objects and their identity and characteristics

  Color Vision
• • Measure of visual function at the photoreceptor level

  • Color encoding


  Physiological Aspect ; COLORIMETRY
• • Measure of cortical function at the later stages of visual processing

  • Color perception affected by surround stimulus, adaptation, and experience 

  Psychological Aspect ; color discrimination & color constancy
• The appearance of color is altered by introducing a second surrounding color.

  COLOR CONTEXT / CHROMATIC CONTRAST/ CHROMATIC INDUCTION / SETTING
• Processes of adaptation constantly adjust visual sensitivity according to the stimulus the observer is currently viewing.

  PRIOR EXPOSURE TO STIMULUS
• • The science and technology that quantifies and physically describes human color perception.

  Colorimetry
• • • It includes the perception of color by the human eye and brain, the origin of color in materials, and the physics of visible electromagnetic spectrum

  COLORIMETRY
• CIE

  Commission Internationale de 'Eclairage 
• Technical, scientific and cultural non-profit organization whose objectives embraces fundamental subjects   as vision, photometry, & colorimetry.

  The international Commision on Illumination
• ability to determine that two spectra differ or the ability to match or detect differences between

  Color