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Understanding Emulators and Digital Imaging in Humanities Computing

This lecture explores the purpose of emulators in computing, focusing on digital imaging concepts. We discuss the differences between raster and vector graphics, including the implications of pixels versus objects in image representation. The importance of resolution (DPI) is examined, comparing various print technologies and their capabilities. We also look into font types—bitmapped, Postscript, and TrueType—and their characteristics for screen versus print use. This lecture is essential for grasping how digital images are created, manipulated, and printed across different mediums.

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Understanding Emulators and Digital Imaging in Humanities Computing

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Presentation Transcript

  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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