digital + analogue

Download Digital + Analogue

Post on 27-May-2015

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Economy & Finance

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

TRANSCRIPT

  • 1. Digital+Analogue

2. 3. 4. 5. 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 47. 48.

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