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Overview

Explore the Curriculum

Instructional Strategies

Introduction to Computers
Circuits and Switches
Digital Information
Microprocessors
The Internet
Technology and Society
Digital Information
Lesson 3: How Computers Work With Pictures
 
Lesson 1: What Is Binary Code?
Lesson 2: A Bit of This and That
Lesson 3: How Computers Work with Pictures
  Activity 1: Work and Play With Pictures
  Activity 2: Pixel Pictures
Lesson 4: Binary Numbers
Lesson 5: Adding Binary Numbers
Lesson 6: ASCII, An Alphabet For Computers
Lesson 7: Can You Go To The Movies?

Digital Images
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How Computers Work With Pictures
Picture this. A computer is made up of millions of electronic switches (transistors). They're either on or off, open or closed.

Now picture this. Your computer screen has hundreds of thousands of dots arranged in rows and columns. Each dot is a picture element or pixel. Each of these pixels displays some combination of red/green/blue according a device called a Video Graphic Array (VGA) The VGA translates binary-coded information (0s and 1s) into the color combinations required to make up an image on your computer screen.


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