Materials And Processes Of Photography Essay, Research Paper
? white light = RGB light in equal amounts
? color is a psycho ? physical response
? color is described in 3 ways:
1. hue
2. lightness
3. saturation
? the human eye sees from 380 ? 770 nm (NOT 400 ? 700nm)
ex./ 380__________550__________770
blue green red
? 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
? 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
? scectrophotometer = machine that measures color, gives a curve of spectral reflectance
* spectral reflectance = of the amount of each color of light reflected
? 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
? achromatic colors = white, grey, black
? gamut = all the possible colors available using RGB
? colorants = pigments and dyes (always subtractive)
? 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)
? white light = RGB light in equal amounts
? color is a psycho ? physical response
? color is described in 3 ways:
4. hue
5. lightness
6. saturation
? the human eye sees from 380 ? 770 nm (NOT 400 ? 700nm)
ex./ 380__________550__________770
blue green red
? theories of how color is seen:
2. 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 ?
4. red ? green
5. yellow ? blue }psychological color sets
6. 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
? 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
? scectrophotometer = machine that measures color, gives a curve of spectral reflectance
* spectral reflectance = of the amount of each color of light reflected
? 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
? achromatic colors = white, grey, black
? gamut = all the possible colors available using RGB
? colorants = pigments and dyes (always subtractive)
? 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)
Bibliography
no references