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26 Cards in this Set
- Front
- Back
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What four ways do we approach color description?
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Human Physiology (Eye-Brain Linkage), Physics (Objects measures of emitted or reflected light, Chemistry (The chemical properties of light emitting surfaces), Art (Color Harmony)
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What is the function of the cornea?
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Protective Clear Coating
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What is the function of the Lens?
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Refracts (changes the direction of) light entering the eye
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What is the function of the iris?
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Muscles that opens and closes to control the amount of light entering the eye (like the diaphragm in a camera [F-Stop])
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What is the function of the retina?
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The back of the eye, similar to the focal plane of a camera
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What is the function of the optic nerve?
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Pathway between the eye and the brain
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Parts of the retina:
What are rod cells? Cone cells? |
Achromatic sensors, color sensors
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Eye-brain cannot identify the color of an area that less than about __ minutes of arc wide (about __ cm at normal reading distance)
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10 minutes, .7 cm
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Color discrimination drops off markedly with poor __________ of the map
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illumination
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When looking at the physical properties of color production: Looking for an objective (not subject orientated) description for color:
What is object mode? Illuminant Mode? |
Object Mode is defined by the object, the light source, and the eye-brain system of the viewer. Illuminant Mode is defined by the light source and the viewer (assuming the light source is also the source of the image [CRT Screen])
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The color of light varies with the energy emitted or reflected over the continuous range of _________ corresponding to visible light.
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wavelengths
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What is the spectral energy distribution curve?
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It specifies the energy-wavelength curve for a light source
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What is Tungsten (spectral energy distribution curve)?
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More energy near the red end of the spectrum
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What is Daylight (spectral energy distribution curve)?
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More energy at the blue end
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What is hue?
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Wavelength (λ), or combination of wavelengths of a color carrying the most energy. It is the difference between bright red and bright orange.
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What is Value?
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It is the relative darkness of a color, holding hue constant. It is the difference between bright red and dark red.
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What is Saturation (chroma, purity)?
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The amount of gray at equal value is added to a color. It is the difference between bright red and bright pink.
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Pure yellow reflects more light than pure violet. T or F.
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True
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Color Specification Systems:
What is Munsell Color Solid? |
It begun with the work of A.H. Munsell, an American Painter. It is a perpetually-based system where colors are defined by physiological testing.
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How many color dimensions define the color space? What are the dimensions?
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Three. Hue, Value, Chroma
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Which division is associated with the hue?
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Division 5 "The Middle Color"
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How is chroma represented?
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It is represented by the perpenicular distance from the central axis towards the surface of the color solid.
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What does the CIE (Commission International de l'Eclairage [International Commission on Illumination]) specify?
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It specifies the proportion of additive primaries required to produce a given color.
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Red, blue, and green are additive primaries. What are Additive Primaries?
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Additive Primaries make other colors by mixing on a white background
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What is a "standard observer"?
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Standard Observer is based on average responses of a normal human eye
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What is a spectrophotometer?
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A device that, for any color, can record the amount of red, blue, and green light reflecting from a surface
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