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Introduction to Humanities Computing

Introduction to Humanities Computing. Spring 1999. Lecture Eleven. Review Operating Systems. What is the purpose of Emulators ?. Digital Image. Fonts Raster/Vector Painting/Drawing Pixels versus Objects. Keyword. DPI * * * Dots per inch Screen - 72 Older Laser printer - 300

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Introduction to Humanities Computing

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  1. Introduction to Humanities Computing Spring 1999 Lecture Eleven

  2. Review Operating Systems What is the purpose of Emulators ?

  3. Digital Image • Fonts • Raster/Vector • Painting/Drawing • Pixels versus Objects

  4. Keyword DPI * * * Dots per inch Screen - 72 Older Laser printer - 300 Older Inkjet printer - 360 to 720 Inkjet printer for photo - 1440 Professional repro - 2400 Dot matrix >> inkjet >> laser

  5. Fonts • Bitmapped fonts • Can only be printed clearly at a single size • Map of Dots • Postscript fonts • Postscript- page description language • Any size, any angle • Filled Outline • Two separate fonts -- one for screen, one for printer • True Type Fonts • Self-contained • Jaggy free • Self-smoothing David Pogue Macs for Dummies

  6. Another keyword • Pixels • Small squares used to represent images

  7. Raster Bitmap images Use a grid of pixels Each pixel assigned location colour Resolution dependent can loose detail when magnified Vector Mathematically defined e.g. a circle with a certain radius, set at a specific location and filled with a specific colour Resolution independent Dots versus Lines Adobe Photoshop User Guide

  8. Painting Raster Control over each dot Drawing Vector Object-oriented Creation and Editing See ClarisWorks demo on CD and screen shots in textbook

  9. Pixels versus Objects See comparison chart in textbook Comment on the following: • Text handling • Printing • Hardware requirements (storage & computation)

  10. One more keyword Resolution • Image resolution number of pixels displayed per unit of printed length usually measured in pixels per inch (ppi) • Monitor resolution number of pixels displayed per unit of length of monitor usually measured in dots per inch depends on size of monitor and pixel setting • Printer resolution number of inkdots per inch

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