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

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