Operation Manual

Glossary 8-1
Software Reference for Scanners
Glossary of Computer Imaging Terms
A/D Conversion analog to digital signal conversion.
absolute address the x and y pixel coordinates in a pixel map using
global coordinates in a locally cropped area of a
larger image .
analog gamma function a non-linear function used in analog signal
processing.
aspect ratio the ratio of width to height in an image. The Nikon
scanner permits the selection of different pitch
resolutions for X and Y axes, and thus alter the
aspect ratio, or ‘stretch’ the image in a vertical or
horizontal direction.
analog signals these electrical signals represent or are “analogous”
to real world events such as a sound or pattern of
light. An “analog” is a simile or representation of
something else.
ASCII a coding system used to represent characters using
binary storage.
auto gamma an automated mode in the scanner firmware to
provide the best gradation tables for the reproduction
of an image.
band sequential color pixels stored in separate planes in the same
file, or as separate files. Sometimes called planar,
screen, or field sequential.