Materials And Processes Of Photography Essay
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Ë white light = RGB light in equal amounts
Ë color is a psycho – physical response
Ë color is described in 3 ways:
1. hue
2. lightness
3. saturation
Ë the human eye sees from 380 – 770 nm (NOT 400 – 700nm)
ex./ 380__________550__________770
blue green red
Ë theories of how color is seen:
1. psycho – physical theory: invented by Young Helmhotlz, the eye sees three colors of light – red, green, and blue – that are reflected from objects.
* three types of vision:
2. trichromatic: sees all three colors
2. dichromatic: sees only two of the three colors
2. monochromatic: sees only black and white
2. opponent vision theory: invented by Herning, perceptors in the eye sees three sets of colors –
1. red – green
2. yellow – blue }psychological color sets
3. black – white
* color after image = when an image that is one of these colors is looked at, when looked away the opposing color is seen
Ë pseudoisochromatic color test = colored images surrounded by grey pebbles
H even people with good color sight can have bad color sight in certain conditions
* photopic vision = daylight, good illuminance, eye peaks at 550nm
* scotopic vision = low illuminance, eye peaks at 505nm
Ë scectrophotometer = machine that measures color, gives a curve of spectral reflectance
* spectral reflectance = of the amount of each color of light reflected
Ë additive primary colors = red, green, blue = subtractive secondary colors
additive secondary colors = cyan, magenta, yellow = subtractive primary colors
* each color is created by the 2 colors next to it on the color wheel
H cyan = no red, magenta = no green, yellow = no blue
* viewing an object under lights the color opposite on the wheel will neutralize the object – the object will appear grey
Ë achromatic colors = white, grey, black
Ë gamut = all the possible colors available using RGB
Ë colorants = pigments and dyes (always subtractive)
Ë Munsell system of color
* 5 main hues: Red, Yellow, Green, Blue, Purple
* 10 major hues: R, RY, Y, YG, G, GB, B, BP, P, PR
H every color comes from these 10 hues
* 3 ways of talking about color for Munsell:
1. value: changes vertically and in increments of 1
2. chroma: changes horizontally and in increments of 2
3. saturation = value + chroma, changes diagonally
* colors named by their hue value/chroma (H V/C)
Ë white light =...
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