digital + analogue
Post on 27-May-2015
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Digital+Analogue
Digital
Digital
uses discretevalues
Digital
uses discretevalues
Analogue
Digital
uses discretevalues
Analogue
uses continuousspectrum of values
digit
Latin for finger
Noise
digital signal
Noise
digital signal signal + noise
Noise
digital signal signal + noise result
Noise
analogue signal
Noise
analogue signal signal + noise
Noise
analogue signal signal + noise result
Data Loss
Analogue Digital
Data Loss
Analogue Digital
To sleepperchanceto dream
To sleepperchanceto dream
Data Loss
Analogue Digital
Digital Signals
smoke signals
morse code
computer modem
beacon fire
Number Systems
Decimal
base 10 systemusing ten digits
Number Systems
Decimal
base 10 systemusing ten digits
Binary
base 2 systemusing two digits
Number Systems
Electronic Signal
on off
Electronic Signal
on
0
off
1
Electronic Signal
Binary Numbers
01
1011
100101110111
100010011010
012345678910
Digital Data
0 or 1 = a ‘ bit ’
8 bits = a ‘ byte ’
1000 bytes = a ‘ kilobyte ’
1000 kilobytes = a ‘ megabyte ’
Digital Data
8 bits
8 7 6 5 4 3 2 1
0 0 0 0 0 1 0 1
can represent values from 0 to 255
Digital Data
16 bits
16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
can represent values from 0 to 65,535
0 1 0 0 0 1 0 0 1 0 1 0 0 1 1 0
Digital Data
24 bits
can represent values from 0 to 16,777,215
Digital Data
32 bits
can represent values from 0 to 4,294,967,295
Bitmap Images
Bit Depth
the number of colourseach pixel can represent
Bitmap Images
Bit Depth
R G B
Bitmap Images
Bit Depth
R G B256 256 256
Bitmap Images
Bit Depth
256 256 256x x
Bitmap Images
Bit Depth
256 256 256x x
= 16,777,216
Bitmap Images
Bit Depth
256 256 256x x
= 16,777,216
= 24 bit
Bitmap Images
Pixel Dimensions
Bitmap Images
Pixel Dimensions
horizontal
vertical
Bitmap Images
File Size
Bitmap Images
File Size
Bit Depth x Pixel Dimensions
Bitmap Images
File Size
Bit Depth x Pixel Dimensions
24 bit 640 x 480
Bitmap Images
File Size
Bit Depth x Pixel Dimensions
16,777,216 307,200x
Bitmap Images
File Size
Bit Depth x Pixel Dimensions
a very big number
Bitmap Images
File Formats
bmpgifjpgpngpsdtifpctepspdf
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