color measurement tutorial
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color measurement tutorial - 4

Evenwhenwejustlookaround,aw i devar i etyofcolorsleap i ntooureyes.Wearesurroundedbyan i nf i n i tevar i etyofcolors i nourda i lyl i ves.However,unl i kelengthorwe i ght,there i snophys i calscaleformeasur i ngcolor,mak i ng i tunl i kelythateveryonew i llanswer i nthesamewaywhenaskedwhatacerta i ncolor i s.Forexample, i fwesayғblueoceanorԓblueskytopeople,each i nd i v i dualw i ll i mag i ned i fferentbluecolors,becausethe i rcolorsens i t i v i tyandpastexper i encesw i llbed i fferent.Th i s i stheproblemw i thcolor.SoletԒsstudyal i ttleanddeterm i newhatk i ndofcolor i nformat i...

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color measurement tutorial - 5

Whatcolor i sth i sapple? > Red! Hmmm. Burningred. BrightRed. Idsaycrimson. 4 size="-3">

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color measurement tutorial - 7

Even though it s actually the same color, it looks different. Why ? > 6 size="-1">

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color measurement tutorial - 9

Tworedballs . Howwouldyoudescr i bethed i fferencesbetweenthe i rcolorstosomeone? > lightdarkvividdull Howbrightisit?Whathueisit?Howvividisit? 8 size="-3">

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color measurement tutorial - 10

Two red balls are shown at left. At f i rst glance they look the same, but upon closer exam i nat i on you real i ze they are d i fferent i n several ways. The color of both i s red, but the color of the upper ball i s somewhat br i ghter and the color of the lower ball i s thus darker. Also, the color of the upper ball appears v i v i d. So you can see that even though they both appear red, the colors of the two balls are d i fferent. When colors are class i f i ed, they can be expressed i n terms of the i r hue(color), l i ghtness(br i ghtness), and saturat i on (v i v i dness). 9 >

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color measurement tutorial - 16

By using a colorimeter, we can obtain results instantly in each color space. > If we measure the color of the apple, we get the follow i ng results: XYZ tr i st i mulus values > X= 21.21Y= 13.37 Z= 9.32 L ∗ a ∗ b ∗ color spaceL > L*= 43.31 a*= 47.63 b*= 14.12 ∗ C ∗ h ∗ color spaceHunter Lab color space Yxy color space > L= 43.31 C= 49.68 h= 16.5L= 36.56a= 42.18b= 8.84 Y= 13.37x= 0.4832y= 0.3045 15 size="-1">

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color measurement tutorial - 19

TheL ∗ a ∗ b ∗ colorspace(alsoreferredtoasCIELAB) i spresentlyoneofthemostpopularcolorspaceformeasur i ngobjectcolorand i sw i delyused i nv i rtuallyallf i elds.It i soneoftheun i formcolorspacesdef i nedbyCIE i n1976 i nordertoreduceoneofthemajorproblemsoftheor i g i nalYxycolorspace:thatequald i stancesonthex,ychromat i c i tyd i agramd i dnotcorrespondtoequalperce i vedcolord i fferences.Inth i scolorspace,L ∗ i nd i catesl i ghtnessanda ∗ andb ∗ arethechromat i c i tycoord i nates.F i gure8showsthea ∗ ,b ∗ chromat i c i tyd i agram.Inth i sd i agram,thea ∗ andb ∗ i nd i catecolord i...

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color measurement tutorial - 21

The L ∗ C ∗ h color space uses the same d i agram as the L > Figure 11 : ∗ a ∗ b ∗ color space, but uses cyl i ndr i cal coord > Portion of a ∗ , b ∗ chromaticity diagram of Figure 8 i nates i nstead of rectangular coord i nates. In th i s color space, L ∗ i nd i cates l i ghtness and i s the same as the L > (Yellow)+b ∗ of the L ∗ a ∗ b ∗ color space, C ∗ i s chroma, and h > ∗ i s the hue angle. The value of chroma C ∗ i s 0 at the center and i ncreases accord i ng to the d i stance from the center. Hue angle h > 5040302010 60 i s def i ned as start i ng at the +a ∗ ax i s and > Hue i s...

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color measurement tutorial - 25

∆ L ∗ = - 0.08 ∆ a ∗ = - 0.02 ∆ b ∗ =0.13 ∆ E ∗ ab=0.15 indicates the measurement point. >

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color measurement tutorial - 29

Why does an apple look red ? > 28 size="-1">

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color measurement tutorial - 31

-rays InfraredVisible lightUltraviolet OrangeYellowGreenBlueIndigoViolet X-rays Cosmic rays > Visible light ӕThe electromagnetic Spectram.

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color measurement tutorial - 32

Most people know that i f we pass l i ght from the sun through a pr i sm, we create a color d i str i but i on l i ke a ra i nbow. Th i s phenomenon was d i scovered by Isaac Newton, who also d i scovered un i versal grav i tat i on. Th i s d i str i but i on of colors i s called a spectrum; separat i ng l i ght i nto a spectrum i s called spectral d i spers i on.The reason that the human eye can see the spectrum i s because those spec i f i c wavelengths st i mulate the ret i na i n the human eye. The spectrum i s arranged i n the order red, orange, yellow, green, i nd i go, and v i olet...

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color measurement tutorial - 33

The human eye can see light in the visible range ; however, ғ light is not the same as ԓ color". Light is defined as radiation which stimulates the retina of the eye and makes vision possible Ӕ . The stimulation of the eye is transmitted to the brain, and it is here that the concept of color Ӕ occurs for the first time, as the response of the brain to the information received from the eye. As can be seen in Figure l6, the principle by which humans perceive color and the principle by which a colorimeter sees color are basically comparable. The method used by the colorimeters discussed in...

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color measurement tutorial - 34

An ob j ect absorbs part of the light from the light source and reflects the remaining light. This reflected light enters the human eye, and the resulting stimulation of the retina is recognized as the ob j ectҒs color Ӕ by the brain. Each ob j ect absorbs and reflects light from different portions of the spectrum and in different amounts ; these differences in absorptance and reflectance are what make the colors of different ob j ects different. 34 >

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color measurement tutorial - 43

Spectrophotometers offer a wide range of features and superior accuracy. Data memory Date commun i cat i on > Measurement data is automatically stored at the time of measurement. RS-232C standard data communication can be performed to output data or control the spectrophotometer. Illum i nant cond i t i ons > Date for a wide variety of CIE Illuminants are stored in memory to allow measurement results to be calculated under various illuminant conditions. Spectral reflectance graph d i splay > Measurement results can be displayed on a spectral reflectance graph. F i xed i llum i nat i on/v i...

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