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Digital Imaging Week 3

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Week 3.

Week 3.

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Transcript

  • 1. Digital Imaging
    • Week 3: What IS digital Imaging?
  • 2. Digital Film
    • The heart of a digital camera is the sensor.
  • 3. Digital Film
    • The heart of a digital camera is the sensor.
    • This takes the form of a CCD - a grid of Charged Coupled Devices.
    CCD Grid
  • 4. Digital Film
    • The heart of a digital camera is the sensor.
    • This takes the form of a CCD - a grid of Charged Coupled Devices.
    CCD Grid
    • These measure the amount of light .
  • 5. It’s Black & White
  • 6. It’s Black & White
  • 7. It’s Black & White Red Separation Green Separation Blue Separation
  • 8.  
  • 9. CMYK
  • 10. CMYK Cyan Magenta Yellow Black
  • 11. Understanding Digital Imaging
  • 12.
    • Pixels
  • 13.
    • Pixels
    Each pixels holds 3 bytes of information: red , green & blue .
  • 14.
    • Pixels
    Each pixels holds 3 bytes of information: red , green & blue .
  • 15.
    • Pixels
    Each pixels holds 3 bytes of information: red , green & blue .
  • 16.
    • Pixels
    Each pixels holds 3 bytes of information: red , green & blue .
  • 17. The Digital Process
  • 18. The Digital Process
    • Shooting
    • Image is composed and shutter released
  • 19. The Digital Process
    • Shooting
    • Image is composed and shutter released
    • Light hits the sensors and each receives a slightly different amount of light.
  • 20. The Digital Process
    • Shooting
    • Image is composed and shutter released
    • Light hits the sensors and each receives a slightly different amount of light.
    • In response to light, each CCD produces an electronic charge - the more light, the bigger the charge. The sensors are filtered with RGB.
  • 21. The Digital Process
    • Shooting
    • Image is composed and shutter released
    • Light hits the sensors and each receives a slightly different amount of light.
    • In response to light, each CCD produces and electronic charge - the more light, the bigger the charge. The sensors are filtered with RGB.
    • 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.
  • 22. The Digital Process
    • Shooting
    • Image is composed and shutter released
    • Light hits the sensors and each receives a slightly different amount of light.
    • In response to light, each CCD produces and electronic charge - the more light, the bigger the charge. The sensors are filtered with RGB.
    • 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.
    • This information is stored on the cameras memory card and the camera is ready to take another shot.
  • 23. The Digital Process
    • Processing & Manipulation
    • The digital files are now transferred to your computer.
    • This can now be enhanced or manipulated using programs like Adobe Photoshop.
    • The enhanced picture is then saved to the computers hard drive.
  • 24. The Digital Process
    • Outputting
    Web Printer CD/DVDs
  • 25. What does Mega Pixel really mean?
  • 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
  • 27. Dots Per Inch Used when printing - pixels are turned into dots per inch and counted by the spread Over the paper.
  • 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
  • 29. Digital & Optical Zoom
  • 30.  
  • 31.  
  • 32.  
  • 33. Interpolation
    • Any means of calculating a new point between two existing data points.
  • 34. Interpolation
    • Any means of calculating a new point between two existing data points is therefore interpolation
  • 35. Image Formats
  • 36.
    • Joint Photographic Experts Group
    JPEGS
  • 37.
    • Joint Photographic Experts Group
    • Can change image size & compression
    JPEGS
  • 38.
    • Joint Photographic Experts Group
    • Can change image size & compression
    • Good for web & printing
    JPEGS
  • 39.
    • Joint Photographic Experts Group
    • Can change image size & compression
    • Good for web & printing
    • Fit more on a device
    JPEGS
  • 40.
    • Joint Photographic Experts Group
    • Can change image size & compression
    • Good for web & printing
    • Fit more on a device
    • Universal file format
    JPEGS
  • 41.
    • Downsides:
    • Loss of quality
    JPEGS
  • 42.
    • Downsides:
    • Loss of quality
    • Less powerful processing
    JPEGS
  • 43.
    • Downsides:
    • Loss of quality
    • Less powerful processing
    • Less control over image
    JPEGS
  • 44.
    • Processed on computer not camera
    RAW
  • 45.
    • Processed on computer not camera
    • Contain every bit of data recorded
    RAW
  • 46.
    • Processed on computer not camera
    • Contain every bit of data recorded
    • Large format printing
    RAW
  • 47.
    • Processed on computer not camera
    • Contain every bit of data recorded
    • Large format printing
    • Colours more accurate
    RAW
  • 48.
    • Downsides:
    • Much bigger file sizes
    RAW
  • 49.
    • Downsides:
    • Much bigger file sizes
    • Not always compatible
    RAW
  • 50.
    • Downsides:
    • Much bigger file sizes
    • Not always compatible
    • No preview
    RAW
  • 51. Memory Cards?
    • Secure Digital (SD)
    • Mini SD
    • Micro SD
    • Compact Flash I & II (CFI & CFII)
    • xD-Picture Card
    • Smart Media
    • Memory Stick/ Memory Stick Duo
    • Internal memory
  • 52. Downloading
    • USB 1.1 & 2.0
    • Card reader
    • Bluetooth
    • Firewire
    • Scanning!
  • 53. Memory Cards
    • DON’T TAKE OUT UNTIL CAMERA IS TURNED OFF!!
  • 54. Memory Cards
    • DON’T TAKE OUT UNTIL CAMERA IS TURNED OFF!!
    • DON’T PULL OUT USB/CARDS FROM COMPUTER UNTIL EJECTED!!
  • 55. Saving
    • Organisation is key!
  • 56. Saving
    • Organisation is key!
    Folders
  • 57. Saving
    • Organisation is key!
    Applications
  • 58. Digital Manipulation
    • We’ve composed our picture, set up our camera, transferred the image on to the computer, saved and organised it.
  • 59. Digital Manipulation
    • We’ve composed our picture, set up our camera, transferred the image on to the computer, saved and organised it.
    • Most home computers are ideal for manipulating images.
  • 60. Digital Manipulation
    • We’ve composed our picture, set up our camera, transferred the image on to the computer, saved and organised it.
    • Most home computers are ideal for manipulating images.
    • Photo stores normally won’t tweak images for you
  • 61. Digital Manipulation
    • We’ve composed our picture, set up our camera, transferred the image on to the computer, saved and organised it.
    • Most home computers are ideal for manipulating images.
    • Photo stores normally won’t tweak images for you
    • Manipulation can be very subtle , not necessarily any crazy effects! A bit brighter, a bit more contrast etc.
  • 62. Digital Manipulation
    • We’ve composed our picture, set up our camera, transferred the image on to the computer, saved and organised it.
    • Most home computers are ideal for manipulating images.
    • Photo stores normally won’t tweak images for you
    • Manipulation can be very subtle, not necessarily any crazy effects! A bit brighter, a bit more contrast etc.
    • Photoshop elements - only about £60, will provide you with most of your photographic needs. Photoshop (full version) has more features but costs about £1000!!!!!
  • 63. Digital Manipulation
    • We’ve composed our picture and set up our camera. Got the image on the computer, saved and organised it.
    • Most home computers are ideal for manipulating images.
    • Photo stores normally won’t tweak images for you
    • Manipulation can be very subtle, not necessarily any crazy effects! A bit brighter, a bit more contrast etc.
    • Photoshop elements - only about £60, will provide you with most of your photographic needs. Photoshop (full version) has more features but costs about £1000!!!!!
    • It’s not difficult!!
  • 64. Some basic digital processing options
  • 65.
    • Basic Image
  • 66.  
  • 67.
    • Dodging & Burning
  • 68.  
  • 69.
    • Crop & resizing
  • 70.  
  • 71.
    • Changing Saturation
  • 72.  
  • 73.
    • White balance
  • 74.  
  • 75.
    • Adjusting brightness & Contrast
  • 76.  
  • 77.
    • Retouching or deleting details
  • 78.  
  • 79.
    • Converting to grayscale
  • 80.  
  • 81.
    • Adding filters or effects
  • 82. Scanning
  • 83. Scanning Why still scan when we have digital cameras?
  • 84.  
  • 85.  
  • 86.  
  • 87.