Appendix E: Glossary - Microtek ScanWizard Pro Reference Manual

Appendix E: Glossary

Cross-referenced entries are indicated in bold type
Bit
The smallest unit of memory in the computer. A bit can be either off or on,
representing a value of 0 or 1. Greater bit-depth translates to more complexity
in image information. Some examples:
Single-bit
Single-bit images use just one bit of data to record each pixel
white.
8-bit grayscale
Images that contain 256 (2
most black-and-white photos accurately. 256 levels of gray is actually more
shades of gray than the human eye can see.
24-bit color
24-bit color images are composed of three 8-bit color channels. When
combined, the red, green and blue channels provide up to 16.7 million possible
combinations (hence, colors). 24-bit color is also known as True Color and
photo-realistic color.
Auto Document Feeder (ADF)
A scanner accessory that helps with text scanning. The ADF allows continuous
scanning of up to 50 pages of text. This accessory is normally used with an OCR
(Optical Character Recognition) software program, not an image-editing
program.
Batch Scan
Sequential scanning of multiple originals using user-defined settings for each.
Brightness
The balance of light and dark shades in an image. Brightness is distinct from
contrast, which measures the range between the darkest and lightest shades in contras contras contras contras
an image. Brightness determines the intensity of shades; contrast determines the
number of shades you get.
bold type. bold type bold type
bold type
8
=256) possible shades of gray needed to represent
pixel pixel
pixel pixel — either black or
OCR OCR OCR OCR
Glossary E-1