Glossary
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tone curve
The graph that shows the contrast ratio between the input (original image) and
output (image data) in image processing.
unsharp mask
Originally a photographic process in which a sharply focussed and a slightly out-
of-focus image are combined to produce a sharper image. This process is
simulated by software to produce the same effect.
USB
A Universal Serial Bus. A hardware interface for connecting low-speed
peripherals such as a keyboard, mouse, scanner, or printer to the computer.
USB hub
A device that normally provides four TYPE A sockets to increase the number of
USB ports on a PC.
Summary of Contents for 1640SU - Perfection Photo Scanner
Page 2: ... 2 ...
Page 44: ...2 20 Scanning Basics High Contrast Increases the contrast of dull images Open Shadow ...
Page 54: ...2 30 Scanning Basics ...
Page 98: ...4 10 Calibrating Your System ...
Page 114: ...5 16 Options Paper support Spare paper path guide ADF Document Mat ...
Page 130: ...5 32 Options ...
Page 172: ...6 42 Maintenance and Troubleshooting ...
Page 185: ...Contacting Customer Support B 1 Appendix B Contacting Customer Support Overview B 2 ...
Page 192: ... 6 Glossary ...