Pyro Industries API-1394PCI Manual de usuario descargar pdf (Pagina 324)

303

■ GLOSSARY

than that of standard-definition television

(SDTV) whose standards are recommended

by the Advanced Television Systems Com-

mitttee (ATSC). Currently there are 18 differ-

ent formats for HDTV.

head frame The first frame in a clip of film or

in a segment of video.

headroom 1. Visually, the amount of room

that should be between the top of a person’s

head and the top of the image in frame com-

position. 2. Technically, the amount of gain

allotted before distortion or clipping of an

audio or video signal is encountered.

heads out Film or tape wound on a reel with

the beginning of the media on the outside of

the reel.

Hertz (Hz) A unit of frequency equal to one

cycle per second.

hi-con An 8-bit, grayscale representation of

an image that determines masked areas for

keys. Also referred to as alpha channel,

holdout, cookie cutter, key channel, matte,

and mask.

HIIP Acronym for Host Image Independence

Protocol. A system that allows the Avid

system to import and export files in various

standard formats. Also called Image

Independence.

histogram In color correction, a graph that

plots the distribution of pixels in an image

based on their brightness. Histograms plot

luminance on the x axis and recurrence of

pixels on a y axis.

H phase Horizontal phase. The horizontal

blanking interval of a given video source.

H-phase is measured between sources and

calibrated to prevent shifting of the video

image in analog composite video.

hue An attribute of a visual sensation that

defines a specific shade of color. Hue is mapped

on a vectorscope, which indicates degrees of

red, green, blue, yellow, cyan, and magenta.

ICC Acronym for the International Color

Consortium, formed in 1993. The ICC

promotes interoperability of color imaging

systems.

IEEE 1394 The international hardware and

software standard for transporting data at

speeds of up to 400 megabits per second

(Mb/s) (1394a) or up to 800 megabits per

second (Mb/s) (1394b). Also known as iLink

(Sony trademark) 1394 and FireWire.

illuminant A source that reflects or transmits

light.

ink numbers Also called Acmade numbers.

Inkjet numbers that are added to a workprint

and mag stock for reference. Can be used in

some nonlinear editors (NLEs). Also used for

preview code. Key numbers are more com-

monly used for digital editing.

in point The starting point of an edit.

insert edit An electronic edit in which the

control track and longitudinal timecode

(LTC) timecode are not replaced during the

editing process.

interlock projector The projector used for

screening workprint and dailies. It consists of

a film projector and mag track player that

can be “interlocked” and remain in sync.

IP Acronym for interpositive print. Created

from the original camera negative (OCN),

this positive print is used to duplicate a nega-

tive. IPs are created for items on a dupe list.

IRE A unit of measurement on a National

Television Standards Committee (NTSC)

waveform monitor for the measurement of

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