Ricoh AP3850C Instrukcja Obsługi Pobierz pdf (Strona 55)

3-3 Understanding calibration

How calibration works

Success in obtaining satisfactory print quality from a color server, such as a

Fiery 3850C, connected to a printer depends on many factors. Among the most

important are establishing and maintaining optimal toner densities. Density is a

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; it 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 3850C that compensate

for the difference between actual (measured) and desired (target) density values.

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 3850C 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.

Measurements

Measurement ﬁles contain numerical values that correspond to the toner density

produced by the 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 from

ColorWise Pro Tools. Then you measure the patches using the EFI Densitometer

100,the X-Rite DTP41 spectrophotometer, or an X-Rite DTP32 densitometer

connected to a computer on the network or the printer’s scanner. The new

measurements are automatically downloaded to the Fiery 3850C.

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Ricoh AP3850C Instrukcja Obsługi Strona 55