15 Color Perception Flashcards
When a person sees a black object: The L-cone ____ is ____, the M-cone ____ is ____, the S-cone _____ is ____
off/active, off/active, on/inactive
Fluorescent light and sunlight both appear white, however, _____ has peaks of different wavelengths at different energy levels and _____ has constant energy levels across the visible spectrum.
fluorescent light, sunlight
A patient can be sensitive to ____ light because of the varied energy/wavelength peaks.
fluorescent
The 3 colors used in subtractive mixing combine to create ____. The 3 colors used in additive mixing combine to create _____.
black, white
Subtracting yellow and blue makes green (T/F)
True
Subtracting pure (narrow wavelength) yellow and blue makes black (T/F)
True
If you add green, blue and red you get ____. If you add green and blue with out the red, you get ____.
white, cyan
An example of additive color mixing is ____. An example of subtractive color mixing is ____.
Additive= Red, green, and blue pixels in your computer screen in the form of light. Subtractive= Cyan, magenta, and yellow as the primary ink colors in an ink cartridge.
Adding (red, green, and blue) produces (cyan, magenta, and yellow) as secondary colors and subtracting (cyan, magenta, and yellow) produce (red, green, and blue) secondary colors (T/F)
TRUE (A secondary color is the result of mixing 2 primary colors) for example green plus blue makes cyan, and magenta minus yellow produces red.
Adding red and green produces:1) Yellow 2) Reddish-green3) Magenta4) Black
1) Yellow
Background colors influence color perception due to _____.
color-opposing ganglion cells
What are the 3 components of color perception?
Hue, Saturation or Chroma, and Lightness/Brightness
Lightness is a product of _____ color mixing. Brightness is a product of _____ color mixing.
subtractive, additive
On a graph of #photons/wavelenth: Hue is the ____, Saturation/Chroma is the ____, Lightness/Brightness is the ____.
mean, variance, area under the curve,
The Munsell color system is (additive or subtractive)?
subtractive
The CIE color system is (additive or subtractive)?
additive
In the Munsell color sytem ____, ____, and ____ represent the 3 axes. In the CIE color system ____, ____, and ____ represent 3 axes.
Munsell = Hue, Saturation, Lightness/BrightnessCIE = primary colors 1, 2 and 3
To portray the 3-dimensional image of the CIE color system as 2-dimensional graph, the values of all 3 axes must add up to ____. A) 1……..B) 2……..C) 3……..D) 22.5
A) 1 (x + y + z = 1)
The point at which all 3 axes (x, y, and z) of the CIE color system converge contain ____.1) white light…………….2) no light3) sun light……………4) the secrets of the universe
2) no light
According to the CIE color space, the point for blue green has the following values: y=0.29 and x=0.03, therefore z must equal ___.
z = 0.68 (x + y + Z = 1)
Complementary colors make ____.
white
Match the following:1) blue…………………… a) M and L cone2) green…………………b) S-cone3) yellow…………………c) M-cone
(1-b) (2-c) (3-a)
All colors can be produced from 2 primary colors? (T/F)
False (all colors can be produced by 3 primary colors)
_____ is a pair of lights or surfaces that look the same but have a different spectra.
Metamer
Color with crayons is an example of _____, whereas, color with light is an example of _____.
subtractive color mixing, additive color mixing
Sunglasses are an example of a band pass filter (T/F)
True
Trichromatic theory is based on relative activation of cones (T/F)
True
The gas in a fluorescent light produces what 3 types of spectrum light?
low, intermediate, and high
Each type of cone has _____ peak sensitivity
one
The peak sensitivity for an S-cone is ____, for an M-cone is _____, and for an L-cone is _____
S = 420nm, M = 530nm, L = 562nm
An example of a monochromatic light is a _____.
laser
White light, such as natural sunlight or fluorescent light, activates which cones?
All 3 cones (S, M, and L) must be activated to see white light
