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# CSCI N241: Fundamentals of Web Design Copyright ©2004  Department of Computer & Information Science Design Concepts: Module A: The Science of Color.

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CSCI N241: Fundamentals of Web Design Copyright ©2004  Department of Computer & Information Science Design Concepts: Module A: The Science of Color

N241: Fundamentals of Web Development Copyright ©2004  Department of Computer & Information Science Goals Understand the origin of natural colorUnderstand the origin of natural color Understand the Additive Color ModelUnderstand the Additive Color Model Understand the Subtractive Color ModelUnderstand the Subtractive Color Model Understand how to represent colors using hexadecimal valuesUnderstand how to represent colors using hexadecimal values

N241: Fundamentals of Web Development Copyright ©2004  Department of Computer & Information Science The Electromagnetic Spectrum Measure of photons, traveling at the speed of light, carrying some type of energyMeasure of photons, traveling at the speed of light, carrying some type of energy Measured in terms of wavelength and frequencyMeasured in terms of wavelength and frequency

N241: Fundamentals of Web Development Copyright ©2004  Department of Computer & Information Science The Electromagnetic Spectrum Image source: http://imagers.gsfc.nasa.gov/ems/waves3.htmlhttp://imagers.gsfc.nasa.gov/ems/waves3.html

N241: Fundamentals of Web Development Copyright ©2004  Department of Computer & Information Science Visible Light Occurs in a small part of the EM spectrum, near the middleOccurs in a small part of the EM spectrum, near the middle Wavelengths are 400nm to 700nm longWavelengths are 400nm to 700nm long Image is from http://imagers.gsfc.nasa.gov/ems/visible.htmlhttp://imagers.gsfc.nasa.gov/ems/visible.html

N241: Fundamentals of Web Development Copyright ©2004  Department of Computer & Information Science Visible Light Image Source: http://imagers.gsfc.nasa.gov/ems/visible.htmlhttp://imagers.gsfc.nasa.gov/ems/visible.html

N241: Fundamentals of Web Development Copyright ©2004  Department of Computer & Information Science Additive Color Model Used by computersUsed by computers When light energy is added, a color appears brighterWhen light energy is added, a color appears brighter Different visible light wavelengths can be combined to create new colorsDifferent visible light wavelengths can be combined to create new colors Image courtesy of Pat Ellison

N241: Fundamentals of Web Development Copyright ©2004  Department of Computer & Information Science Additive Color Model Image courtesy of Pat Ellison

N241: Fundamentals of Web Development Copyright ©2004  Department of Computer & Information Science Subtractive Color Model Used in the print mediaUsed in the print media When more color is added, a color appears darkerWhen more color is added, a color appears darker Ink or paint can be thought of a filter that filters out all colors except the color being perceived, which is reflectedInk or paint can be thought of a filter that filters out all colors except the color being perceived, which is reflected Image courtesy of Pat Ellison

N241: Fundamentals of Web Development Copyright ©2004  Department of Computer & Information Science Subtractive Color Model Image courtesy of Pat Ellison

N241: Fundamentals of Web Development Copyright ©2004  Department of Computer & Information Science Primary Colors Technically, pure primary colors are spectral colors which cannot be mixed from other colorsTechnically, pure primary colors are spectral colors which cannot be mixed from other colors A small number of colors can be mixed to create new colorsA small number of colors can be mixed to create new colors

N241: Fundamentals of Web Development Copyright ©2004  Department of Computer & Information Science Primary Colors The Additive Color Model uses Red, Green and Blue (RGB) as Additive PrimariesThe Additive Color Model uses Red, Green and Blue (RGB) as Additive Primaries The Subtractive Color Model uses Cyan, Magenta, Yellow and Black (CYMK) as Subtractive PrimariesThe Subtractive Color Model uses Cyan, Magenta, Yellow and Black (CYMK) as Subtractive Primaries

N241: Fundamentals of Web Development Copyright ©2004  Department of Computer & Information Science Some Color Terms Hue – A specific location on the visible spectrumHue – A specific location on the visible spectrum Saturation – Specifies the amount (intensity) of a colorSaturation – Specifies the amount (intensity) of a color

N241: Fundamentals of Web Development Copyright ©2004  Department of Computer & Information Science Some Color Terms Value (Brightness) – Specifies the darkness/lightness of a color. Adding WHITE to a color produces a TINT. Adding BLACK to a color produces a SHADE.Value (Brightness) – Specifies the darkness/lightness of a color. Adding WHITE to a color produces a TINT. Adding BLACK to a color produces a SHADE.

N241: Fundamentals of Web Development Copyright ©2004  Department of Computer & Information Science The Color Wheel A common way to map color is to use the Color WheelA common way to map color is to use the Color Wheel All hues are depicted as an angle on the wheel (0° represents RED and 360° represents VIOLET)All hues are depicted as an angle on the wheel (0° represents RED and 360° represents VIOLET)

N241: Fundamentals of Web Development Copyright ©2004  Department of Computer & Information Science The Color Wheel Saturation is represented as a percentageSaturation is represented as a percentage Value is represented as a percentageValue is represented as a percentage RED, YELLOW and BLUE are the color wheels primary colorsRED, YELLOW and BLUE are the color wheels primary colors

N241: Fundamentals of Web Development Copyright ©2004  Department of Computer & Information Science Representing a Color Image courtesy of Pat Ellison

N241: Fundamentals of Web Development Copyright ©2004  Department of Computer & Information Science Color as a Numeric Constant Digital Color is normally represented as a numeric constant in triplet format, representing RGB valuesDigital Color is normally represented as a numeric constant in triplet format, representing RGB values In many graphic programs RGB values are represented as a percentage (0%-100%) or as an integer (0-255)In many graphic programs RGB values are represented as a percentage (0%-100%) or as an integer (0-255) On the web, color triplets are often represented using hexadecimal numbersOn the web, color triplets are often represented using hexadecimal numbers

N241: Fundamentals of Web Development Copyright ©2004  Department of Computer & Information Science Common Hex Values RGB051102153204255 PERC0%20%40%60%80%100% HEX00336699CCFF

N241: Fundamentals of Web Development Copyright ©2004  Department of Computer & Information Science Common Hex Colors RED (Hex: #ff0000)RED (Hex: #ff0000) GREEN (Hex: #00ff00)GREEN (Hex: #00ff00) BLUE (Hex: #0000ff)BLUE (Hex: #0000ff) WHITE (Hex: #ffffff)WHITE (Hex: #ffffff) BLACK (Hex: #000000)BLACK (Hex: #000000)

N241: Fundamentals of Web Development Copyright ©2004  Department of Computer & Information Science Common Hex Colors MAGENTA (Hex: #ff00ff)MAGENTA (Hex: #ff00ff) CYAN (Hex: #00ff00)CYAN (Hex: #00ff00) YELLOW (Hex: #ff0000)YELLOW (Hex: #ff0000) GRAY (Hex: #808080)GRAY (Hex: #808080)

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