Post on 18-Jan-2016
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