Matrox Orion Installation And Hardware Reference page 62

62 Appendix C: Glossary
Horizontal sync
The part of a video signal that indicates the end of a line and
the start of a new one.
See also vertical sync.
HSL
A color space that represents color using components of hue,
saturation, and luminance. The hue component describes the
actual color of a pixel. The saturation component describes
the concentration of that color. The luminance component
describes the combined brightness of the primary colors.
Host
In general, Host refers to the principal CPU in one's
computer.
Interlaced scanning
Describes a transfer of data in which the odd-numbered lines
of the source are written to the destination buffer first and
then the even-numbered lines (or vice-versa).
See also progressive scanning.
Keying
A display effect that switches between two display sources
depending on the pixel values in one of the sources. Keying
is used to make portions of the overlay frame buffer surface
transparent so that corresponding areas of the underlay
frame buffer surface can show through it.
Latency
The time from when an operation is started to when the final
result is produced.
Live processing
See real-time processing.
LUT mapping
Look-up table mapping. A point-to-point operation that uses
a table to define a replacement value for each possible pixel
value in an image.