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Raster Graphics and Color

Raster Graphics and Color. Dr. Paige H. Meeker Computer Science Presbyterian College, Clinton, SC. Overview. Display hardware  How are images displayed? Raster graphics systems  How are imaging systems organized? Color models  How can we describe and represent colors?.

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Raster Graphics and Color

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  1. Raster Graphics and Color Dr. Paige H. Meeker Computer Science Presbyterian College, Clinton, SC

  2. Overview • Display hardware  How are images displayed? • Raster graphics systems  How are imaging systems organized? • Color models  How can we describe and represent colors?

  3. Display Hardware • Video display devices • Cathode Ray Tube (CRT) • Liquid Crystal Display (LCD) • Plasma panels • Thin-film electroluminescent displays • Light-emitting diodes (LED) • Hard-copy devices • Ink-jet printer • Laser printer • Film recorder • Electrostatic printer • Pen plotter

  4. Cathode Ray Tube (CRT)

  5. Liquid Crystal Display (LCD)

  6. Raster Graphics Systems

  7. Specifying Color Color perception usually involves three quantities:  Hue: Distinguishes between colors like red, green, blue, etc  Saturation: How far the color is from a gray of equal intensity  Lightness: The perceived intensity of a reflecting object • Sometimes lightness is called brightness if the object is emitting light instead of reflecting it. • In order to use color precisely in computer graphics, we need to be able to specify and measure colors.

  8. How Do Artists Do It? • Artists often specify color as tints, shades, and tones of • saturated (pure) pigments • • Tint: Adding white to a pure pigment, decreasing saturation • • Shade: Adding black to a pure pigment, decreasing lightness • • Tone: Adding white and black to a pure pigment

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