The Digital Revolution Changing information. What is Digital? Discrete values used for Input Processing Transmission Storage Display Derived.

The Digital RevolutionThe Digital Revolution

Changing informationChanging information

What is Digital?What is Digital?

Discrete values used forInputProcessing TransmissionStorageDisplay

Derived from digit Not analog

Discrete values used forInputProcessing TransmissionStorageDisplay

Derived from digit Not analog

Analog SignalsAnalog Signals

ContinuousFrequencyAmplitudeSmall variations significantDisadvantage - noiseAnalog computers

ContinuousFrequencyAmplitudeSmall variations significantDisadvantage - noiseAnalog computers

Why Digital?Why Digital?Analog

Sound and light wavesContinuous waveforms

DigitalDescribe sound and light as

a string of binary data representations (1s and 0s)

Provides exact reproduction of sounds and color

AnalogSound and light wavesContinuous waveforms

DigitalDescribe sound and light as

a string of binary data representations (1s and 0s)

Provides exact reproduction of sounds and color

Analog-to-Digital Conversion

Analog-to-Digital Conversion

Sampling RateSampling Rate

Sample - numeric representation of wave

Rate - how many samples taken in a specific time period

Wave values between sample interpolated

Typical sampling rates 44.1 kHz to 48 kHz

Sample - numeric representation of wave

Rate - how many samples taken in a specific time period

Wave values between sample interpolated

Typical sampling rates 44.1 kHz to 48 kHz

Digital ImagesDigital Images

PixelsResolutionColor depth

4 bits - 16 colors8 bits - 256 colors24-32 bits - true color

PixelsResolutionColor depth

4 bits - 16 colors8 bits - 256 colors24-32 bits - true color

Original Computer Monitors

Original Computer Monitors

Using only 1 bit to store color, original computer monitors used only two colors

Using only 1 bit to store color, original computer monitors used only two colors

Early Computer GraphicsEarly Computer Graphics

Early computer graphics only used four colors at any one time

Early computer graphics only used four colors at any one time

More bits - More ColorMore bits - More Color

As technology advanced, computer monitors could display 16 colors at one time

Next came 256 colors

As technology advanced, computer monitors could display 16 colors at one time

Next came 256 colors

Real colorReal color

24 bits - 16 million colorsCalled true color32 bits - adds transparency

24 bits - 16 million colorsCalled true color32 bits - adds transparency

Raster Graphics vs. Vector Graphics

Raster Graphics vs. Vector Graphics

Raster graphics - painting pixelsVector graphic - uses objects

Raster graphics - painting pixelsVector graphic - uses objects

Enhancing Photos and Adding Special Effects

Enhancing Photos and Adding Special Effects

Image-editing software

Types of enhancementRedeye removalCropCorrect color

balanceFiltering effects

Image-editing software

Types of enhancementRedeye removalCropCorrect color

balanceFiltering effects

Dabble EmbossRippleOriginal

Click to see various photo effects

Digital VideoDigital Video

Combines digital images with digital sound

Two types InterlacedProgressive scan

Reduces cost of film creationCopes good as original

Combines digital images with digital sound

Two types InterlacedProgressive scan

Reduces cost of film creationCopes good as original

Data CompressionData Compression

Encoding information using fewer bits

Goal - reduce file sizeLossless Compression Lossy CompressionAll compression leads to data loss

Encoding information using fewer bits

Goal - reduce file sizeLossless Compression Lossy CompressionAll compression leads to data loss

Digital TechnologyDigital Technology

Media IntegrityMedia IntegrationFlexible InteractionTransactionsTailoringEditing

Media IntegrityMedia IntegrationFlexible InteractionTransactionsTailoringEditing

What’s the results?What’s the results?

Information AgeDigital RevolutionInformation EconomyBetter and cheaper access to

knowledge

Information AgeDigital RevolutionInformation EconomyBetter and cheaper access to

knowledge