Data Bases • Custom Term Papers • Free Term Papers • Free Research Papers • Free Essays • Free Book Reports • Plagiarism? Links • Top 100 Term Paper Sites • Top 25 Essay Sites • Top 50 Essay Sites • Search 97,000 Papers @ DirectEssays.com • Search 101,000 Papers @ ExampleEssays.com • Search 90,000 Papers @ MegaEssays.com Free Essays • Term Paper Sites • Chuck III's Free Essays • Free College Essays • TermPaperSites.com • My Term Papers • Get Free Essays • Essay World • Planet Papers	Search Lots of Essays Back to Subjects - Science Materials and Processes of Photography Materials and Processes of Photography Ë white light = RGB light in equal amounts Ë color is a psycho – physical response Ë the human eye sees from 380 – 770 nm (NOT 400 – 700nm) ex./ 380__________550__________770 blue green red 1. psycho – physical theory: invented by Young Helmhotlz, the eye sees three colors of light – red, green, and blue – that are reflected from objects. 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 – 2. yellow – blue }psychological color sets * 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) * 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 = RGB light in equal amounts Ë color is a psycho – physical response Ë the human eye sees from 380 – 770 nm (NOT 400 – 700nm) ex./ 380__________550__________770 blue green red 2. psycho – physical theory: invented by Young Helmhotlz, the eye sees three colors of light – red, green, and blue – that are reflected from objects. 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 – 5. yellow – blue }psychological color sets * 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) * 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 Word Count: 837
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