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CGT511-03-Colors

CGT511-03-Colors - Lecture overview CGT 511 Color in CG...

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CGT 511 Color in CG d ř i h š h Bed ich Beneš, Ph.D. Purdue University Department of Computer Graphics © Bedrich Benes Lecture overview What is color? Meaning of color Color in CG (RGB, CMY, CMYK, Gamut) RGB to Grayscale © Bedrich Benes What is color? Color is a subjective experience of light. Color of an object… is difficult… What we see is the reflected light . What is the color of a blue cube illuminated by a red light? Color depends on many aspects… © Bedrich Benes Meaning of Color D d Depends on Culture white death or innocence? white – death or innocence? Shared archetypal aspects red – color of blood fire red – color of blood, fire blue – color of sky, sea green – foliage, ocean Contextual Purdue colors © Bedrich Benes
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Meaning of Color Some things are strange… Red seems closer than blue Why? Blue – sky © Bedrich Benes Meaning of Color Some things are strange… Red seems closer than green. Why? green foliage © Bedrich Benes Meaning of Color Wash the foreground with red and the background with blue depth sensation Blue fill in the Euro American culture dark areas, night… Is this true? © Bedrich Benes Meaning of Color © Bedrich Benes
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Meaning of Color Warm Colors : Red, Orange, Yellow Warm colors advance Cool Colors : Green, Blue Cool Colors recede © Bedrich Benes Color temperature William Kelvin (1800) heated carbon block glows color= f (temperature) Measured in Kelvins [K] © Bedrich Benes Color temperature Candle: 1900 Fluorescent lamp 2600 7500 Tungsten lamp 2700 2900 Film and projection lamp 2850 3200 Moonlight 4100 Daylight 5800 6500 Clear Blue Sky 10,000 26,000 © Bedrich Benes Color temperature © Bedrich Benes
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Color temperature The color temperature is used in classical cinematography and photography The color balance is set to certain temperature The color scheme is centered around it The white balance used in digital cameras © Bedrich Benes Color Scheme and Contrast C l h Color scheme is the total set of colors used by an image C l h h i i Color scheme creates the impression before the viewer sees the contents! Color contrast i th diff f th d k t d th is the difference of the darkest and the brightest color High contrast attracts attention © Bedrich Benes Color Scheme Primary colors used to create any other color None of them should be expressed from the others In art: RYB In CG: RGB © Bedrich Benes Color Scheme Secondary colors in the given color scheme are the colors expressed from the primary colors © Bedrich Benes
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Color in CG RGB ( R d G Bl ) Red , Green , Blue additive color system – based on OPTICS (more color brighter the result) denoted by [R, G, B] R=G=B gray colors [0,0,0] is black
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