Color Imaging and ReproductionColor ProductionColor ReproductionColor MeasurementCalibrated Color ReproductionWhat is Color?Red, Green, Yellow, ...Hue, Tone, Tint ...Response of Eye to StimulusPerception of StimulusAnything Not a MaskColor DevicesDevice Characteristics Additive or SubtractiveBilevel or MultilevelMonitors (Additive)Printers (Subtractive)Color MonitorsRed, Green, Blue PrimariesThree Phosphor Dots/PixelMultilevelFull ColorColor Lookup Tables40 spi to 100 spiColor PrintersThree or Four ColorCyan, Magenta, YellowAbove Plus BlackCMY, CMYKBilevel or Multilevel150 to 2500 spiDigital Color PrintingBilevel TechnologiesInkjetElectrostaticXerographyThermal TransferOffset PrintingMultilevel TechnologiesPhotographic ProcessesThermal SublimationHalftone PatternsPattern of Variable Sized DotsHalftone ScreenOriginally Mechanical50 to 200 lines/inchDifferent RotationsTrade Spatial Resolution for GrayscaleDigital HalftonesMultiple Printer Pixels/DotGray Levels vs. Sharp Edges10:1 typical10 by 10 = 101 gray levels150 lines = 1500 spiDigital Color PrintersPoor ResolutionGood AlignmentDesigning Colors on Monitors for PrintersAdditive vs. Subtractive ColorDifferent Viewing EnvironmentsUser ModelFunctional ColorSelect Percentage CMYKRGB to CMY(K) AutomaticallyColor ReproductionGoalSame ImageDifferent Output DevicesSame AppearanceGraphic Arts Rules-of-ThumbCustomer SatisfactionColor Names Don't ChangeGray Scale is Smooth and GrayGood ContrastGray Scale ProductionMonitorsR=G=B is Gray Gamma Correction Linear in IntensityPrintersC=M=Y is Not Gray  Gray BalancingLinear in DensityDensity = Log[1/R]RGB to CMY(K)If Inks were Ideal Filters [C,M,Y] = [1,1,1] - [R, G, B] Inks are Not Ideal FiltersSpectra Overlap Not Inverse of Monitor SpectraColor Correction RequiredColor CorrectionMap Input to Output ColorsCompensateFor Color ImpurityFor Color of PrimariesDifferent GamutsTechniquesSingle Linear TransformationPiecewise InterpolationColor MeasurementMeasure What the Eye Sees ColorimetryInstruments Measure the Stimulus Empirically DerivedMetrics Standardized by the CIEDevice CalibrationDefine Device Propertiesin Colorimetric TermsModel or MeasureSet of All Possible Colors Defines GamutCalibrated Color ReproductionColor Correction Based on Colorimetric InformationCalibrated DevicesPossible Reproduction LevelsMatch SurfacesMatch Tristimulus Values Match Chromaticity CoordinatesMatch AppearanceAIC ExperimentColor in Computer Generated DisplaysAIC Interim Meeting, 19-20 June 1986Color Research and ApplicationVol. 11, Supplement, June 1986John Wiley and Sons, NY, NYWith John Beatty and William CowanWhat We LearnedGoal is Appearance MatchMap to Control AppearanceMap to Control Out-of-Gamut ColorsDon't Match ExactTristimulus ValuesChromaticity CoordinatesConclusionsIncreasing Number of Digital Color DevicesMany are Poor QualityMany are Badly Used Color Reproduction Important Issue for Computer Graphics CommunityColor Measurement Key to Quality Reproduction    J  ColorImagingText.tiogaMaureen Stone, July 22, 1987 10:21:21 pm PDTÊª  •WordlistkImaging Inkjet Pixel Phosphor Multilevel Bilevel CMY RGB Subtractive CMYK vs Halftone Sublimation Cyan spi ˜ ™Icode™,—head˜K˜K˜K˜K˜—˜K˜K˜K˜K˜K˜—˜˜J˜J˜—J˜J˜—˜K˜Kšœ˜˜
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