CSci 105

Introduction to Computers

Lecture 13

© Morris Firebaugh

I. Introduction


B. How Users See Input and Output

C. Input: Getting Data from User to Computer

D. Introduction to Adobe Photoshop

II. How Users See Input and Output

Recall the General Structure of a Computer



III. Input: Getting Data from User to Computer

IV. Classification of Input Devices


Pointing Devices

Figure 2.15 Three mice: PC Mouse on left, Apple Mouse, old style, in center, and Apple Mouse, new style, on right. (Video image captured with Computer Eyes.)

Figure 2.17 Mechanical mouse assembly. As the mouse is moved, the rubber ball protruding from the bottom turns, causing one or both contact rollers to turn. As they turn the shaft on the optical shutter detector, a train of square electrical pulses is generated which can be decoded to read motion. (Figure based on Figure 5, Inside Macintosh, Vol. III, p.28)


Direct Input - Source Data Automation


IV. Introduce Adobe Photoshop

Some good References on Photoshop

Adobe Photoshop Features



Context-Dependent Windows

Photoshop Filters

Consider Assignment # 7

Updated February 26, 2001