Digital+Analogue

Digital

Digital uses discrete values

Digital uses discrete values Analogue

Digital uses discrete values Analogue uses continuous spectrum 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 sleep perchance to dream To sleep perchance to dream

Data Loss Analogue Digital

Digital Signals smoke signals morse code computer modem beacon fire

Number Systems

Decimal base 10 system using ten digits Number Systems

Decimal base 10 system using ten digits Binary base 2 system using two digits Number Systems

Electronic Signal

on off Electronic Signal

on 0 off 1 Electronic Signal

Binary Numbers 0 1 10 11 100 101 110 111 1000 1001 1010 0 1 2 3 4 5 6 7 8 9 10

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 colours each pixel can represent

Bitmap Images Bit Depth R G B

Bitmap Images Bit Depth R G B 256 256 256

Bitmap Images Bit Depth 256 256 256 x x

Bitmap Images Bit Depth 256 256 256 x x = 16,777,216

Bitmap Images Bit Depth 256 256 256 x 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 16,777,216 307,200 x

Bitmap Images File Size Bit Depth x Pixel Dimensions a very big number

Bitmap Images File Formats bmp gif jpg png psd tif pct eps pdf