How to use Digital Technology

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How to use Digital Technology

• Digital Scanner Demonstration
• By
• Instructional Technology Services, SAISD

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Topics Covered

• Understanding how a scanner functions
• What is a flatbed scanner
• How to choose the correct scanner resolution
• Shopping for a scanner

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Understanding how a scanner functions
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What is a Scanner

• A device that will take a snapshot of whatever
  is placed in the platen (or scanner bed)
• Uses bits and bytes to store the converted data
  on to your PC as a digital image file (just like
  a digital camera)
• Operates by moving a sensor containing a single
  row of light-sensitive pixels across a certain
  area. These pixels will register the light value
  of the image one line at a time. The data is
  sent to the computer an a copy of the image is
  rebuilt by the scanning program.

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What is a flatbed scanner
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Flatbed Scanner

• A long narrow tray on which you place your
  document or photo.
• The scanner head or sensor will travel along the
  length of the bed in order to create the digital
  image.
• Newer models connect using USB, but older models
  may still use a parallel cable.

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How to choose the correct scanner resolution
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High resolution Scanners

• Will capture greater detail in the images
  (especially the lightest and darkest portions)
• You can scan small images and print them at a
  larger size and still maintain the clarity.

• Are more expensive than the lower-resolution
  scanners.

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Things to Remember

• Resolution dependent on the speed and accuracy
  of the motor that moves the sensor (containing
  light-sensitive pixels) past the document on the
  flatbed.
• Scanners are rated by its resolution or the speed
  in which they can convert documents into digital
  images.

• A scanners rating is the optical resolution of
  the imaging system by the resolution of the step
  motor. (1200x2400dpi)

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Shopping for a scanner
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What to look for?

• Resolution (rate by which they convert documents
  into digital images).
• Color Depth listed in bits per pixel.
  Inexpensive scanner maybe 24-bit or they can
  digitize as many as 16.7 million colors. More
  expensive

models can work as 30, 36, or even 48 bits per
pixel (billions of colors)
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Scanners
99.99
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Scanners
198.74