1. Chapter 8
Digital Media

2. 8 Digital Audio Basics
Digital representation of sound
2
Chapter 8: Digital Media

3. 8 Digital Audio Basics
Sound cards are responsible for transforming
bits stored in an audio file into music, sound
effects, and narrations
– Digital signal processor
3
Chapter 8: Digital Media

4. 8 Bitmap Graphics
Composed of a grid of dots
– Color of each dot is stored as a binary number
4
Chapter 8: Digital Media

5. 8 Scanners and Cameras
Graphics software is used to modify or edit
bitmap graphics
– Modify individual pixels to
• Retouch photographs
• Wipe out red eye
• MANY other fixes!
• Ethics of digital editing???
5
Chapter 8: Digital Media

6. 8 Image Resolution
Expressed as the number of horizontal and
vertical pixels
– Higher resolutions contain more data (larger file
size) and are higher quality
Bitmaps do not have a fixed physical size
6
Chapter 8: Digital Media

7. 8 Image Compression
Any technique that recodes data in an image
file so it contains fewer bits
7
Chapter 8: Digital Media

8. 8 Digital Video Basics
Uses bits to store color and brightness data
for each video frame
Different kinds of digital videos:
– Desktop video
– Web-based video
– DVD-video
– PDA video
8
Chapter 8: Digital Media

9. 8 Video Transfer
Raw, uncompressed formats are ideal for
editing
Video capture software can:
– Decrease video display size
– Reduce the frame rate
– Compress data
9
Chapter 8: Digital Media

10. 8 Video Output
10
Chapter 8: Digital Media

11. 8 DRM Basics
Digital rights management (DRM) is a
collection of techniques used by copyright
holders to limit access and use of digital
content
11
Chapter 8: Digital Media

12. 8 CD Copy Protection
Copy protection refers to technologies
designed to prohibit consumers from copying
content
12
Chapter 8: Digital Media

13. 8 DVD DRM
Copy generation management is a digital
watermark that specifies the number of times
a content stream can be duplicated
13
Chapter 8: Digital Media

14. 8 Today’s Fun Thought
Why doesn't glue stick to the
inside of the bottle?

15. 8 Quotable
When deeds speak, words are nothing
African proverb