Xerox DocuColor 12 Printer with Fiery EX12 产品宣传页

Success in obtaining satisfactory print quality from a color server such as a Fiery 
connected to a copier/printer depends on many factors. Among the most important 
are establishing and maintaining optimal toner densities. The 

 is the measure of 

the light absorbed by a surface. By carefully regulating toner densities, you can obtain 
consistent printed color.

Even with a calibrated system, toner density is affected by service settings, humidity, 
and temperature; density also tends to drift over time. Regular measurement detects 
day-to-day variations in densities, and calibration corrects for them.

Calibration works by creating calibration curves on the Fiery that compensate for the 
difference between actual (measured) and desired (target) density values. These 
calibration curves are the graphic equivalent of transfer functions, which are 
mathematical descriptions of changes that will be made to the data you start with. 
Transfer functions are often graphed as input or output curves.

The Fiery generates calibration curves after comparing measured values to the final 
target values for each of the four toner colors. The target values are based on the output 
profile specified.

Measurement files contain numerical values that correspond to the toner density 
produced by the copier/printer when it prints solid cyan, magenta, yellow, and black, 
and graduated tints of those colors.

To create a measurement file, first print a page of color patches. Then measure the 
patches using either a color measurement instrument connected to a computer on the 
network or, if it is available, the print device’s scanner. The new measurements are 
automatically downloaded to the Fiery.