Linearization; Spectrophotometer - Xante Accel-a-Graphix CT4 User Manual

performance. That is, to ensure that there is a linear relationship
between the color percentage requested by an input device (image)
and the color percentage created by the output device (printer) across
each color gradient. With XANTÉ's Command Center and
Linearizer, you can use a spectrophotometer, colorimeter, or
densitometer to calibrate your printer to a selected standard.
An overview of these processes and measuring devices is presented
in this section. See chapter 8, "Color Management" for more
information.

Linearization

Linearization is color calibration of equipment which compensates
for printer differences such as age, manufacturing anomalies, and
environmental conditions.
To calibrate a printer, a calibration strip is printed using XANTÉ's
Command Center. This color output from the printer is measured
against a standard, using a calibrated color measuring device such as
a spectrophotometer, colorimeter or densitometer. These devices
measure how far from a linear model your printer is currently
performing. A linear model is one in which your printer responds
with the exact color percentage requested by the image at every
increment across the color gradient.
XANTÉ's Linearizer uses this data to calculate the adjustments
required to linearize your printer's performance. It creates and
downloads to the controller a custom transfer curve which calibrates
your printer to the linear model.

Spectrophotometer

A spectrophotometer measures the wavelengths of light reflected
from, transmitted through or emitted from the output of a device,
such as a monitor or printer. The light is broken into bands, each of
which represents a portion of the visible spectrum.
_______________________________________ Imaging Basics 7-11