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Questions and Answers
______ is the perception of color as red, green, etc.
______ is the perception of color as red, green, etc.
Hue
______ is the level of saturation of color.
______ is the level of saturation of color.
Chroma
______ is the relative lightness or darkness of a color.
______ is the relative lightness or darkness of a color.
Value
Tint is a high value color made by adding ______ to a hue.
Tint is a high value color made by adding ______ to a hue.
______ is a medium value color made by adding grey to a hue.
______ is a medium value color made by adding grey to a hue.
Shade is a low value color made by adding ______ to a hue.
Shade is a low value color made by adding ______ to a hue.
Complementary Colors are any two colors of light that when mixed together produce ______.
Complementary Colors are any two colors of light that when mixed together produce ______.
The complementary color of red light is ______ light.
The complementary color of red light is ______ light.
Additive Colour Mixing involves adding two colors to create a new color without changing the ______.
Additive Colour Mixing involves adding two colors to create a new color without changing the ______.
Red + green gives ______.
Red + green gives ______.
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Study Notes
Colour Perception and Mixing
- Projection of two colors on a white surface creates a new perceived color.
- Color Gamut: The range of colors that can be produced by specific component colors.
- Subtractive Mixing: Begins with white light where unwanted colors are removed using filters; e.g., white light minus non-blue light yields blue.
- Additive Mixing: Produces brighter results as it combines light rather than filtering (contrasts with subtractive mixing).
Color Blindness
- Primarily affects red and green perception, occurring in 4% of males and 0.25% of females.
- A sex-linked recessive genetic trait located on the X chromosome.
- Males with one X chromosome are more susceptible as they only need the gene present on one chromosome to be color blind.
- Females have two X chromosomes and need the gene present on both to exhibit color blindness.
CIE Colour Triangle
- Spectral colors are plotted on two sides of the triangle, with red and violet-blue forming the base.
- Chromaticity coordinates identify each color.
- Saturated colors are located on the circumference; the center represents white.
Colour Temperature
- Defines different hues of white light.
- Incandescent sources change color with temperature: dull red → orange → yellow → white → pale blue.
- Different incandescent materials emit distinct colors at a given temperature.
Black Body Radiation
- A perfect black body absorbs all radiation across all wavelengths.
- Emission characteristics depend on uniform temperature, known as black-body radiation.
- At each temperature, a black body emits a specific color.
Correlated Colour Temperature (CCT)
- CCT measures light source color appearance relative to the blackbody locus.
- Represented as a single number, simplifying the description of chromaticity.
- Light sources with different spectral power distributions (SPDs) but identical chromaticities will share the same CCT.
- In CIE 1976 chromaticity diagrams, isotemperature lines help determine the CCT of light sources.
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