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Chapter 14 Working with Graphics Getting Started In this Chapter, you will learn: About different graphics you can work with on your PC When to use bitmap graphics Which format to use When to use vector graphics How to create 3-D graphics About Hardware: Digitizing devices

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getting started
Getting Started
  • In this Chapter, you will learn:
    • About different graphics you can work with on your PC
    • When to use bitmap graphics
    • Which format to use
    • When to use vector graphics
    • How to create 3-D graphics
    • About Hardware: Digitizing devices

Practical PC 5th Edition Chapter 14

what kinds of graphics can i work with on my pc
What kinds of graphics can I work with on my PC?
  • Pictures that you can create, modify, download, and transmit using your PC are referred to as graphics or images
  • You can obtain ready-made images
    • Clip art and stock photo collections
    • Pictures scanned from books or magazines
  • You can use photos from your own collection or your digital camera
  • You will typically work with two types of graphics: vector and bitmap

Practical PC 5th Edition Chapter 14

what kinds of graphics can i work with on my pc4
What kinds of graphics can I work with on my PC?

Practical PC 5th Edition Chapter 14

when should i use bitmap graphics
When should I use bitmap graphics?
  • Bitmap graphics, sometimes called raster graphics, represent an image as a grid of colored dots
    • Photograph-like images used for photos and Web page images
    • Stored as BMP, TIFF, GIF, PNG and JPEG
    • Manipulate the image using paint software
  • Quality depends on resolution and color depth
    • Resolution is the width and height of the grid that holds the dots and each dot is assigned a color code
    • Color depth is the number of bits required to store the color number. The more colors, the more storage space needed
      • 1-bit color depth produces a black and white image
      • 8 bit color depth produces 256 colors
      • 24-bit color depth produces 16.7 million colors, sometimes referred to as true color

Practical PC 5th Edition Chapter 14

how do i know what format to use
How do I know what format to use?
  • File format depends on how you plan to use it
    • For printed publications, use a format that retains a high resolution and 24-bit color depth
    • For the Web or e-mail attachments, you can use more compact formats
  • To reduce file size
    • Shrink the physical dimensions of the image
    • Use compression techniques
    • Reduce the color depth
  • Rules of thumb
    • JPEG format offers the best quality in the smallest file size
    • For diagrams, logos, screenshots, and images containing text, use PNG format
    • GIF works best for logos and images that contain solid blocks of color or a limited range of colors

Practical PC 5th Edition Chapter 14

when should i use vector graphics
When should I use vector graphics?
  • Vector graphics consist of a set of geometrical shapes
    • Each shape is defined as a series of line segments called vectors
    • Vector graphics are ideal for diagrams, line drawings, and computer-aided design (CAD)
  • Vector graphics resemble line drawings more than photographs
    • File size tends to be small since shapes can be stored efficiently
    • Graphics can shrink or expand with no loss of quality
    • You can modify each shape in a vector graphic independently
  • Vector graphics are often saved as EPS, WMF, or CAD formats
  • Drawing software provides tools to create and manipulate vector graphics

Practical PC 5th Edition Chapter 14

how do i create 3 d graphics
How do I create 3-D graphics?
  • 3-D graphics contain objects that appear three-dimensional
    • 3-D objects have the data necessary to display, rotate, and view from any angle
    • 3-D objects are composed of vectors and are created using same drawing and CAD software that produces 2-D graphics
  • To create a 3-D object
    • Produce a wire frame or a line drawing outlining every surface of the object
    • Render the object by applying texture, transparency, and color to its surface
    • Your PC automatically determines where to put highlights and shadows using a process called ray tracing
    • Rendered 3-D graphics have a new-car-brochure look that is sometimes referred to as “super-realistic”

Practical PC 5th Edition Chapter 14

how do i create 3 d graphics9
How do I create 3-D graphics?

Creating a 3-D graphic

Practical PC 5th Edition Chapter 14

hardware digitizing devices
Hardware: Digitizing devices
  • Digitizing converts an image into a series of 1s and 0s that your PC can store and display
  • Digitizing devices allow you to convert real objects, such as a photo, into a digital format
  • Graphics tablet
    • Works like an electronic canvas
    • Use a pen-shaped stylus to “paint”
    • Some graphics software does not support the use of a graphics tablet
    • Connects to USB port
    • Cost from U.S. $70 to $500+

Practical PC 5th Edition Chapter 14

hardware digitizing devices11
Hardware: Digitizing devices
  • Scanner
    • Reads text, images, and bar codes
    • Typically used for flat objects such as photos
    • Flatbed scanners are the most popular and resemble small photocopiers
    • Connects to USB port
    • Basic unit costs about U.S. $49
    • Bundled with software
      • Scanning software allows you to preview a scan, select a resolution, and initiate a scan from your PC
      • OCR (optical character recognition) software allows you to convert an image into a text file

Practical PC 5th Edition Chapter 14

hardware digitizing devices12
Hardware: Digitizing devices
  • Digital camera
    • Takes photos and stores them as bitmap images
    • Connects to USB port
    • Can also insert memory card from camera into PC
    • Transferred images are stored on your PC
    • Camera prices depend on resolution measured in megapixels. A basic camera costs under U.S. $200 and mid-range cameras cost $200-$1000
    • You can open files using paint or photo editing software

Practical PC 5th Edition Chapter 14

hardware digitizing devices13
Hardware: Digitizing devices

Graphics Tablet

Scanner

Practical PC 5th Edition Chapter 14

shoes ufos and forrest gump
Shoes, UFOs, and Forrest Gump?
  • What do you think?
    • In your opinion, should photos and videotapes be allowed as evidence in civil and criminal trials?
    • Do you think that it would be possible for someone to use doctored photos and videotapes to convince people that a fake event took place?
    • Do you have a set of criteria for judging the authenticity of newspaper and TV images?

Practical PC 5th Edition Chapter 14

chapter summary
Chapter Summary
  • You should now know:
    • About the kinds of graphics you can work with on your PC
    • Know when to use bitmap graphics
    • Know what format to use
    • Know when to use vector graphics
    • How to create 3-D graphics
    • About digitizing devices

Practical PC 5th Edition Chapter 14

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