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 manufacturerNB. The TWAIN Working Group is a not-for-profit organization which represents the imaging industry. TWAIN’s 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

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.

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.

Scanner connections

Older scanners Slow parallel ports SCSI devices

Current scanners USB FireWire All PnP-compliant

Use Device Manager to update driver

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.

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

ResolutionsMegapixels Good for Max print size Found in

Under 1 MP Broadcasting over the Internet

Web cameras (webcams)

1 to 2 MP E-mailing pictures 4x6 inches Camera phones, still shot on digital video cameras, older digital cameras

3 to 4 MP Printing, e-mailing, using on Web if you crop image

5x7 inches Mid-range, consumer-grade, digital cameras

5 to 8 MP Large prints 8x10 inches “Prosumer” digital cameras

Over 8 MP Professional use; very large prints

11x14 inches and larger

Prosumer and professional grade digital cameras

Digital camera memory cards

CompactFlash Memory Stick Secure Digital SmartMedia xD-Picture Card

Printing images

No film development costs Store and view photos on computer Print at home Print at store Home prints aren’t same quality as store

Digital camera memory cards (con’t)

Memory stick

SD card

Compact flash memory cards

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

Memory card readers

Camera connection problems

Batteries Cable Camera mode Device manager

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