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Raster Graphics and Color

This overview explores the fundamental aspects of raster graphics and color representation in computer science, with a focus on display hardware and imaging systems. It covers various display technologies, including CRT, LCD, and LED, and examines color models and perception, detailing how colors are specified through hue, saturation, and lightness. It also discusses how artists use tints, shades, and tones to communicate colors effectively. This foundational knowledge is essential for anyone interested in computer graphics and image processing.

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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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