HP Designjet L25500 Printer series - Manual (Page 52)

In outline, the process consists of the following steps.
1. A calibration test chart is printed.
2. The HP Embedded Spectrophotometer (or, if you prefer, a different spectrophotometer) scans and
measures the test chart.
3. The RIP uses the measurements to calculate the necessary correction factors for consistent color
printing on that substrate.
Color profiles
Color calibration provides consistent colors, but consistent colors are not necessarily accurate. For
instance, if your printer prints all colors as black, its colors may be consistent but they are not accurate.
In order to print accurate colors, it is necessary to convert the color values in your files to the color values
that will produce the correct colors from your printer, your inks and your substrate. A color profile is a
description of a printer, ink and substrate combination that contains all the information needed for these
color conversions.
These color conversions are performed by your Raster Image Processor (RIP), not by the printer. For
further information on the use of color profiles, see the documentation for your application software and
for your RIP.
In addition to the color profiles used for printing, you may wish to calibrate and profile your monitor
(display device), so that the colors you see on the screen relate more closely to those that you see on
your prints.
48 Chapter 4 Handle the substrate ENWW
Handle the su
bstrate