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

1. Digital+Analogue

6. Digital

7. Digital uses discrete values

8. Digital uses discrete values Analogue

9. Digital uses discrete values Analogue uses continuous spectrum of values

10. digit Latin for finger

11. Noise digital signal

12. Noise digital signal signal + noise

13. Noise digital signal signal + noise result

14. Noise analogue signal

15. Noise analogue signal signal + noise

16. Noise analogue signal signal + noise result

17. Data Loss Analogue Digital

18. Data Loss Analogue Digital To sleep perchance to dream To sleep perchance to dream

19. Data Loss Analogue Digital

20. Digital Signals smoke signals morse code computer modem beacon fire

21. Number Systems

22. Decimal base 10 system using ten digits Number Systems

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

24. Electronic Signal

25. on off Electronic Signal

26. on 0 off 1 Electronic Signal

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

28. Digital Data 0 or 1 = a ‘ bit ’ 8 bits = a ‘ byte ’ 1000 bytes = a ‘ kilobyte ’ 1000 kilobytes = a ‘ megabyte ’

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

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

31. Digital Data 24 bits can represent values from 0 to 16,777,215

32. Digital Data 32 bits can represent values from 0 to 4,294,967,295

33. Bitmap Images Bit Depth the number of colours each pixel can represent

34. Bitmap Images Bit Depth R G B

35. Bitmap Images Bit Depth R G B 256 256 256

36. Bitmap Images Bit Depth 256 256 256 x x

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

38. Bitmap Images Bit Depth 256 256 256 x x = 16,777,216 = 24 bit

39. Bitmap Images Pixel Dimensions

40. Bitmap Images Pixel Dimensions horizontal vertical

41. Bitmap Images File Size

42. Bitmap Images File Size Bit Depth x Pixel Dimensions

43. Bitmap Images File Size Bit Depth x Pixel Dimensions 24 bit 640 x 480

44. Bitmap Images File Size Bit Depth x Pixel Dimensions 16,777,216 307,200 x

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

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