1. Introduction to Humanities Computing
Spring 1999
Quick Q&A
Have they done evening classes before?
Spring Session?
Group work?
Lecture Eleven

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

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

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

5. Fonts David Pogue Macs for Dummies 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. Dots versus Lines Adobe Photoshop User Guide Raster Vector
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
Adobe Photoshop
User Guide

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