GT ME 8883 - ME 8883 Physical Properties of Paper Measurement - Lecture 13 Brightness and Color (46 pages)

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ME 8883 Physical Properties of Paper Measurement - Lecture 13 Brightness and Color



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ME 8883 Physical Properties of Paper Measurement - Lecture 13 Brightness and Color

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Lecture Notes


Pages:
46
School:
Georgia Institute of Technology
Course:
Me 8883 - Sp Top-Mech of Materials

Unformatted text preview:

ME 8883 Physical Properties of Paper Measurement Lecture 13 Brightness and Color Material taken from Technidyne and HunterLab commercial literature and other web resources 1 Color instruments in 351 lab directional and ISO 2 3 Color measurements are dependent on the illuminant spectrum of incident light A source is not an illuminant Most instruments use and A source filtered to produce a C illuminant e g QTH D illuminants are representative of spectral power distributions of various of actual daylight D50 is used in graphics art industry for viewing color transparencies and prints F2 is cool white F7 brad band daylight F11 is narrow band 4 5 Instrument measurements of color require to correlate to visual perceptions of color Technidyne diagram illustrating concept 1931 CIE established the Standard Observer monochromatic light is projected onto a white screen 3 controllable red green blue sources also projected are adjusted by the observer to match the monochromatic spot wavelength is varied from 400 to 700 nm 6 HunterLab depiction of the 1931 CIE Standard Observer experiment 7 In the retina Rods respond to intensity only night vision Cone receptors 3 types responsive to red green and blue In 1931 it was thought the cones were distributed around the fovea later found to be distributed farther so experiments were redone fro 10 degrees observation angle in 1964 8 CIE Commission INternationale de l Eclairage System 1st quantitative tristimulus system 1931 Defined observer sample illumination 45 observations 0 76 observers Illumination A Tungsten light at 2854 5 K B Direct sunlight C Average diffuse sunlight northern hemisphere D Fluorescent light E Pure white light Primary Colors Red R 700 0 nm Green G 546 1 nm Blue B 435 8 nm X Y Z 9 Four criteria Only positive values need be combined to create any color y green primary function chosen to match standard luminosity assume a standard observer White light when tristimulus values are all equal X Y Z X C E x R d Y C E yR d



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