chapter 8 digital media

Digital Media

Chapter 8

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Chapter 8: Digital Media 2

Digital Audio Basics Digital representation of sound

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Chapter 8: Digital Media 3

Digital Audio Basics Sound cards are responsible for transforming

bits stored in an audio file into music, sound effects, and narrations– Digital signal processor

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Chapter 8: Digital Media 4

Bitmap Graphics Composed of a grid of dots

– Color of each dot is stored as a binary number

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Chapter 8: Digital Media 5

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???

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Chapter 8: Digital Media 6

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

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Chapter 8: Digital Media 7

Image Compression Any technique that recodes data in an image

file so it contains fewer bits

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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

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Video Transfer Raw, uncompressed formats are ideal for

editing Video capture software can:

– Decrease video display size– Reduce the frame rate– Compress data

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Chapter 8: Digital Media 10

Video Output

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Chapter 8: Digital Media 11

DRM Basics Digital rights management (DRM) is a

collection of techniques used by copyright holders to limit access and use of digital content

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Chapter 8: Digital Media 12

CD Copy Protection Copy protection refers to technologies

designed to prohibit consumers from copying content

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Chapter 8: Digital Media 13

DVD DRM Copy generation management is a digital

watermark that specifies the number of times a content stream can be duplicated

8 Today’s Fun Thought

Why doesn't glue stick to the inside of the bottle?

8 Quotable

When deeds speak, words are nothing

African proverb