Digital Imaging Week 3

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Week 3.

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  • Digital Imaging Week 3

    1. 1. Digital Imaging <ul><li>Week 3: What IS digital Imaging? </li></ul>
    2. 2. Digital Film <ul><li>The heart of a digital camera is the sensor. </li></ul>
    3. 3. Digital Film <ul><li>The heart of a digital camera is the sensor. </li></ul><ul><li>This takes the form of a CCD - a grid of Charged Coupled Devices. </li></ul>CCD Grid
    4. 4. Digital Film <ul><li>The heart of a digital camera is the sensor. </li></ul><ul><li>This takes the form of a CCD - a grid of Charged Coupled Devices. </li></ul>CCD Grid <ul><li>These measure the amount of light . </li></ul>
    5. 5. It’s Black & White
    6. 6. It’s Black & White
    7. 7. It’s Black & White Red Separation Green Separation Blue Separation
    8. 9. CMYK
    9. 10. CMYK Cyan Magenta Yellow Black
    10. 11. Understanding Digital Imaging
    11. 12. <ul><li>Pixels </li></ul>
    12. 13. <ul><li>Pixels </li></ul>Each pixels holds 3 bytes of information: red , green & blue .
    13. 14. <ul><li>Pixels </li></ul>Each pixels holds 3 bytes of information: red , green & blue .
    14. 15. <ul><li>Pixels </li></ul>Each pixels holds 3 bytes of information: red , green & blue .
    15. 16. <ul><li>Pixels </li></ul>Each pixels holds 3 bytes of information: red , green & blue .
    16. 17. The Digital Process
    17. 18. The Digital Process <ul><li>Shooting </li></ul><ul><li>Image is composed and shutter released </li></ul>
    18. 19. The Digital Process <ul><li>Shooting </li></ul><ul><li>Image is composed and shutter released </li></ul><ul><li>Light hits the sensors and each receives a slightly different amount of light. </li></ul>
    19. 20. The Digital Process <ul><li>Shooting </li></ul><ul><li>Image is composed and shutter released </li></ul><ul><li>Light hits the sensors and each receives a slightly different amount of light. </li></ul><ul><li>In response to light, each CCD produces an electronic charge - the more light, the bigger the charge. The sensors are filtered with RGB. </li></ul>
    20. 21. The Digital Process <ul><li>Shooting </li></ul><ul><li>Image is composed and shutter released </li></ul><ul><li>Light hits the sensors and each receives a slightly different amount of light. </li></ul><ul><li>In response to light, each CCD produces and electronic charge - the more light, the bigger the charge. The sensors are filtered with RGB. </li></ul><ul><li>The electronic pulses are collated, converted to digital information and stored according to their position on the CCD. This uses a special chip called an ADC chip. </li></ul>
    21. 22. The Digital Process <ul><li>Shooting </li></ul><ul><li>Image is composed and shutter released </li></ul><ul><li>Light hits the sensors and each receives a slightly different amount of light. </li></ul><ul><li>In response to light, each CCD produces and electronic charge - the more light, the bigger the charge. The sensors are filtered with RGB. </li></ul><ul><li>The electronic pulse are collated, converted to digital information and stored according to their position on the CCD. This uses a special chip called an ADC chip. </li></ul><ul><li>This information is stored on the cameras memory card and the camera is ready to take another shot. </li></ul>
    22. 23. The Digital Process <ul><li>Processing & Manipulation </li></ul><ul><li>The digital files are now transferred to your computer. </li></ul><ul><li>This can now be enhanced or manipulated using programs like Adobe Photoshop. </li></ul><ul><li>The enhanced picture is then saved to the computers hard drive. </li></ul>
    23. 24. The Digital Process <ul><li>Outputting </li></ul>Web Printer CD/DVDs
    24. 25. What does Mega Pixel really mean?
    25. 26. What does Mega Pixel really mean? 1536 x 2048 = 3 million 2800 pixels 1536 pixels 2048 pixels 3008 pixels 4290 pixels 2800 x 4290 = 12 million 2000 x 3008 = 6 million 2000 pixels
    26. 27. Dots Per Inch Used when printing - pixels are turned into dots per inch and counted by the spread Over the paper.
    27. 28. Dots Per Inch Used when printing - pixels are turned into dots per inch and counted by the spread Over the paper. DPI Printer dots
    28. 29. Digital & Optical Zoom
    29. 33. Interpolation <ul><li>Any means of calculating a new point between two existing data points. </li></ul>
    30. 34. Interpolation <ul><li>Any means of calculating a new point between two existing data points is therefore interpolation </li></ul>
    31. 35. Image Formats
    32. 36. <ul><li>Joint Photographic Experts Group </li></ul>JPEGS
    33. 37. <ul><li>Joint Photographic Experts Group </li></ul><ul><li>Can change image size & compression </li></ul>JPEGS
    34. 38. <ul><li>Joint Photographic Experts Group </li></ul><ul><li>Can change image size & compression </li></ul><ul><li>Good for web & printing </li></ul>JPEGS
    35. 39. <ul><li>Joint Photographic Experts Group </li></ul><ul><li>Can change image size & compression </li></ul><ul><li>Good for web & printing </li></ul><ul><li>Fit more on a device </li></ul>JPEGS
    36. 40. <ul><li>Joint Photographic Experts Group </li></ul><ul><li>Can change image size & compression </li></ul><ul><li>Good for web & printing </li></ul><ul><li>Fit more on a device </li></ul><ul><li>Universal file format </li></ul>JPEGS
    37. 41. <ul><li>Downsides: </li></ul><ul><li>Loss of quality </li></ul>JPEGS
    38. 42. <ul><li>Downsides: </li></ul><ul><li>Loss of quality </li></ul><ul><li>Less powerful processing </li></ul>JPEGS
    39. 43. <ul><li>Downsides: </li></ul><ul><li>Loss of quality </li></ul><ul><li>Less powerful processing </li></ul><ul><li>Less control over image </li></ul>JPEGS
    40. 44. <ul><li>Processed on computer not camera </li></ul>RAW
    41. 45. <ul><li>Processed on computer not camera </li></ul><ul><li>Contain every bit of data recorded </li></ul>RAW
    42. 46. <ul><li>Processed on computer not camera </li></ul><ul><li>Contain every bit of data recorded </li></ul><ul><li>Large format printing </li></ul>RAW
    43. 47. <ul><li>Processed on computer not camera </li></ul><ul><li>Contain every bit of data recorded </li></ul><ul><li>Large format printing </li></ul><ul><li>Colours more accurate </li></ul>RAW
    44. 48. <ul><li>Downsides: </li></ul><ul><li>Much bigger file sizes </li></ul>RAW
    45. 49. <ul><li>Downsides: </li></ul><ul><li>Much bigger file sizes </li></ul><ul><li>Not always compatible </li></ul>RAW
    46. 50. <ul><li>Downsides: </li></ul><ul><li>Much bigger file sizes </li></ul><ul><li>Not always compatible </li></ul><ul><li>No preview </li></ul>RAW
    47. 51. Memory Cards? <ul><li>Secure Digital (SD) </li></ul><ul><li>Mini SD </li></ul><ul><li>Micro SD </li></ul><ul><li>Compact Flash I & II (CFI & CFII) </li></ul><ul><li>xD-Picture Card </li></ul><ul><li>Smart Media </li></ul><ul><li>Memory Stick/ Memory Stick Duo </li></ul><ul><li>Internal memory </li></ul>
    48. 52. Downloading <ul><li>USB 1.1 & 2.0 </li></ul><ul><li>Card reader </li></ul><ul><li>Bluetooth </li></ul><ul><li>Firewire </li></ul><ul><li>Scanning! </li></ul>
    49. 53. Memory Cards <ul><li>DON’T TAKE OUT UNTIL CAMERA IS TURNED OFF!! </li></ul>
    50. 54. Memory Cards <ul><li>DON’T TAKE OUT UNTIL CAMERA IS TURNED OFF!! </li></ul><ul><li>DON’T PULL OUT USB/CARDS FROM COMPUTER UNTIL EJECTED!! </li></ul>
    51. 55. Saving <ul><li>Organisation is key! </li></ul>
    52. 56. Saving <ul><li>Organisation is key! </li></ul>Folders
    53. 57. Saving <ul><li>Organisation is key! </li></ul>Applications
    54. 58. Digital Manipulation <ul><li>We’ve composed our picture, set up our camera, transferred the image on to the computer, saved and organised it. </li></ul>
    55. 59. Digital Manipulation <ul><li>We’ve composed our picture, set up our camera, transferred the image on to the computer, saved and organised it. </li></ul><ul><li>Most home computers are ideal for manipulating images. </li></ul>
    56. 60. Digital Manipulation <ul><li>We’ve composed our picture, set up our camera, transferred the image on to the computer, saved and organised it. </li></ul><ul><li>Most home computers are ideal for manipulating images. </li></ul><ul><li>Photo stores normally won’t tweak images for you </li></ul>
    57. 61. Digital Manipulation <ul><li>We’ve composed our picture, set up our camera, transferred the image on to the computer, saved and organised it. </li></ul><ul><li>Most home computers are ideal for manipulating images. </li></ul><ul><li>Photo stores normally won’t tweak images for you </li></ul><ul><li>Manipulation can be very subtle , not necessarily any crazy effects! A bit brighter, a bit more contrast etc. </li></ul>
    58. 62. Digital Manipulation <ul><li>We’ve composed our picture, set up our camera, transferred the image on to the computer, saved and organised it. </li></ul><ul><li>Most home computers are ideal for manipulating images. </li></ul><ul><li>Photo stores normally won’t tweak images for you </li></ul><ul><li>Manipulation can be very subtle, not necessarily any crazy effects! A bit brighter, a bit more contrast etc. </li></ul><ul><li>Photoshop elements - only about £60, will provide you with most of your photographic needs. Photoshop (full version) has more features but costs about £1000!!!!! </li></ul>
    59. 63. Digital Manipulation <ul><li>We’ve composed our picture and set up our camera. Got the image on the computer, saved and organised it. </li></ul><ul><li>Most home computers are ideal for manipulating images. </li></ul><ul><li>Photo stores normally won’t tweak images for you </li></ul><ul><li>Manipulation can be very subtle, not necessarily any crazy effects! A bit brighter, a bit more contrast etc. </li></ul><ul><li>Photoshop elements - only about £60, will provide you with most of your photographic needs. Photoshop (full version) has more features but costs about £1000!!!!! </li></ul><ul><li>It’s not difficult!! </li></ul>
    60. 64. Some basic digital processing options
    61. 65. <ul><li>Basic Image </li></ul>
    62. 67. <ul><li>Dodging & Burning </li></ul>
    63. 69. <ul><li>Crop & resizing </li></ul>
    64. 71. <ul><li>Changing Saturation </li></ul>
    65. 73. <ul><li>White balance </li></ul>
    66. 75. <ul><li>Adjusting brightness & Contrast </li></ul>
    67. 77. <ul><li>Retouching or deleting details </li></ul>
    68. 79. <ul><li>Converting to grayscale </li></ul>
    69. 81. <ul><li>Adding filters or effects </li></ul>
    70. 82. Scanning
    71. 83. Scanning Why still scan when we have digital cameras?

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