TWAIN never the twain shall meet

1
TWAIN (never the twain shall meet)

• Supported by scanners and imaging applications
• Never the twain shall meet
• TWAIN eases scanner connection
• Most scanners have more full-featured software
  from manufacturer
  
• NB. The TWAIN Working Group is a not-for-profit
  organization which represents the imaging
  industry. TWAINs purpose is to provide and
  foster a universal public standard which links
  applications and image acquisition devices. The
  ongoing mission of this organization is to
  continue to enhance the standard to accommodate
  future technologies

2
Scanner configuration features

• Image type Sets the grayscale, color or line
  art
  
• Scan mode Sets to high speed or high quality
• Scan resolution Sets the DPI (dots per inch) to
  be used for the scanned image.
  
• Scaling Specifies whether the image is the same
  size as the original or is enlarged or reduced
  from the size of the original.
  
• Destination Sends to a file (converting it from
  an analog image to a digital file) or directly to
  a printer (where the scanner functions as a
  component in a copier)
• Image control Inverts the image (swap black and
  white also referred to as a negative image.) ,
  enables color balancing, controls the brightness
  and contrast of the image, rotates the image ,
  mirrors the image.
• Preview features Zoom in and out the scan area
  without affecting the affecting the scanned
  image, preview what the scanner will output.
  Preview area usually has a feature to select a
  specific area of the scanned image to scan to a
  file or printer.
• Scan Performs the scan in which the image is
  scanned and the output is sent to the destination
  configured in the software.

3
Optical Character Recognition

• Scan text to graphics image
• Install OCR software to edit and search docs.
• OCR is good with typed docs
• Handwritten text is difficult for OCR to
  interpret.

4
Scanner connections

• Older scanners
• Slow parallel ports
• SCSI devices
• Current scanners
• USB
• FireWire
• All PnP-compliant
• Use Device Manager to update driver

5
Troubleshooting (ASID)

• Acquire information about the problem
• Simplify by removing any non-critical components,
  shut down unnecessary running programs, and
  disconnect from the Internet or network.
  
• Implement by identifying probable causes and
  implementing potential solutions one at a time.
  
• Document the error symptoms, the components you
  removed from the computer, and the solutions you
  tried and whether they were successful.

6
Digital cameras

• Connect via USB or FireWire
• May or may not require drivers
• Quality of picture expressed in mega pixels
• Cameras available from 1 mega pixel to over 8
  mega pixels

7
Resolutions
8
Digital camera memory cards

• CompactFlash
• Memory Stick
• Secure Digital
• SmartMedia
• xD-Picture Card

9
Printing images

• No film development costs
• Store and view photos on computer
• Print at home
• Print at store
• Home prints arent same quality as store

10
Digital camera memory cards (cont)
Compact flash memory cards
SD card
Memory stick
11
Digital camera connections

• Still cameras - USB
• Video camera Firewire
• Devices run on batteries
• Rechargeable
• Disposable
• If disposable, use digital-rated
• Card readers
• Built-in
• External device

12
Memory card readers
13
Camera connection problems

• Batteries
• Cable
• Camera mode
• Device manager

14
Unit summary

• Described, installed, and resolved issues with
  CRT displays
  
• Described, installed, and resolved issues with
  LCD displays
  
• Connected and used speakers and a microphone
• Connected and resolved issues with digital
  cameras and scanners