色差培训英文课件.ppt

COLORIMETRY (COLOR MEASUREMENT)  It is the result of the physical modification of the light by an object as observed by the human eye and interpreted by the brain White Light Consists of Many Colors Object / Light Interactions An object modifies light by: Reflection Absorption Scattering Transmission Reflection of light Scattering The ability of an object to reflect incident light in many directions different from the direction of the incident light Opaque/Absorb The ability to capture the incident light and not transmit or scatter it Transparent The ability to allow the incident light to pass through an object without being scattered or absorbed Translucent The ability to allow the incident light on an object to transmit, absorb, and scatter the incident light at the same time in various amounts of each Surrounding ColorsIs Each Circle the Same Color? Recommendations for Visual Evaluations: Standardise Communicate Color MeasurementSolves Problems Such As...............  - Color vision deficiencies - Emotional decision-making - Surround color interference - Varying light sources - Shift of color standard over time Color Measurement3 Requirements Observer.................... CIE Standard Observer Light Source.............. CIE Standard Illuminants Object........................ Spectral Curve CIE Standard Observer CIE Standard Observer 2O vs. 10O Why Is the Apple Red? Spectral Curve = “Fingerprint” Spectral Curve = “Fingerprint” Color Measurement Observer CIE Standard Observer Numerical Models of Color Munsell ................. Hue Value/Chroma CIE ........................ X,Y, Z (Tristimulus Values) x, y (Chromaticity Co-ordinates) Hunter ................... L,a,b, DE CIE LAB ................ L*, a*, b*, C*, h*, DE* CMC ..................... L*, C*, H*, DE(cmc) CIE L*a*b* Color Space Color Tolerancing: Historical Data Color Tolerancing: Historical Data Color Tolerancing Ellipse Color Ellipses