Filter Wheel
A movable wheel containing three color filters and one dark filter which
reside in the optical path and color the imaging beam.
GPIB
General Purpose Information Bus; also known as IEEE 488-1978 in-
terface. A standard data communications interface that allows high-
speed transmission of data from one device to another.
Hexadecimal
The representation of numbers in the base-16 number system, using
the ten digits 0-9 and the six letters A through F.
Host Computer
A computer from which the film recorder receives image data and com-
mands via the SCSI or GPIB Bus.
Initiator
A SCSI device (usually a host system) that requests an operation to be
performed by another SCSI device.
Intensity Calibration
Checking the CRT hardware to ensure it matches the intensity value
for each of the levels in the brightness table. The film recorder auto-
matically adjusts this intensity value. Calibration may be performed
either automatically or manually.
Least Significant Bit
In a binary number, the bit representing the lowest exponent of 2.
Look-up Table (LUT)
A table translating one set of values into another based on a known re-
lationship. LUTs compensate for nonlinear film sensitivity. Different
LUTs are required to produce similar results on different film types.
Microprocessor
The component of the film recorder (and of microcomputers) which per-
forms logic, computational and control functions.
A-10 • PCR II Plus User Guide
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