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# Digital + Analogue

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To accompany a talk introducing the concept of a digital image to art and design students.

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### Digital + Analogue

1. 1. Digital+Analogue
2. 6. Digital
3. 7. Digital uses discrete values
4. 8. Digital uses discrete values Analogue
5. 9. Digital uses discrete values Analogue uses continuous spectrum of values
6. 10. digit Latin for finger
7. 11. Noise digital signal
8. 12. Noise digital signal signal + noise
9. 13. Noise digital signal signal + noise result
10. 14. Noise analogue signal
11. 15. Noise analogue signal signal + noise
12. 16. Noise analogue signal signal + noise result
13. 17. Data Loss Analogue Digital
14. 18. Data Loss Analogue Digital To sleep perchance to dream To sleep perchance to dream
15. 19. Data Loss Analogue Digital
16. 20. Digital Signals smoke signals morse code computer modem beacon fire
17. 21. Number Systems
18. 22. Decimal base 10 system using ten digits Number Systems
19. 23. Decimal base 10 system using ten digits Binary base 2 system using two digits Number Systems
20. 24. Electronic Signal
21. 25. on off Electronic Signal
22. 26. on 0 off 1 Electronic Signal
23. 27. Binary Numbers 0 1 10 11 100 101 110 111 1000 1001 1010 0 1 2 3 4 5 6 7 8 9 10
24. 28. Digital Data 0 or 1 = a ‘ bit ’ 8 bits = a ‘ byte ’ 1000 bytes = a ‘ kilobyte ’ 1000 kilobytes = a ‘ megabyte ’
25. 29. 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
26. 30. 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
27. 31. Digital Data 24 bits can represent values from 0 to 16,777,215
28. 32. Digital Data 32 bits can represent values from 0 to 4,294,967,295
29. 33. Bitmap Images Bit Depth the number of colours each pixel can represent
30. 34. Bitmap Images Bit Depth R G B
31. 35. Bitmap Images Bit Depth R G B 256 256 256
32. 36. Bitmap Images Bit Depth 256 256 256 x x
33. 37. Bitmap Images Bit Depth 256 256 256 x x = 16,777,216
34. 38. Bitmap Images Bit Depth 256 256 256 x x = 16,777,216 = 24 bit
35. 39. Bitmap Images Pixel Dimensions
36. 40. Bitmap Images Pixel Dimensions horizontal vertical
37. 41. Bitmap Images File Size
38. 42. Bitmap Images File Size Bit Depth x Pixel Dimensions
39. 43. Bitmap Images File Size Bit Depth x Pixel Dimensions 24 bit 640 x 480
40. 44. Bitmap Images File Size Bit Depth x Pixel Dimensions 16,777,216 307,200 x
41. 45. Bitmap Images File Size Bit Depth x Pixel Dimensions a very big number
42. 46. Bitmap Images File Formats bmp gif jpg png psd tif pct eps pdf