HP 815MFP - Manual (Page 64)

58 hp designjet 815mfp & scanner 4200
Calibration is the process of setting the scanner device to known
color conditions so that it performs in accordance with an
established standard. When you calibrate your scanner to the ANSI
IT8 color standard, you minimize color deviations between scanned
ANSI IT8 reference color patches (on the IT8 Calibration reference
sheet) and known color reference values.
The calibrating wizard lets you select between sRGB and NTSC
color spaces. With the sRGB standard you get optimal color
matching between your touch screen, scanner and printer.
why?
Scanner calibration ensures stability, reproducibility and
predictability of color output. Light sources and other parts in the
scanner can change over time and this affects the scanner’s
interpretation of colors and its linearity. Without calibration, the
output produced by your scanner half a year from now will differ
from output produced today and will likely be noticeably
inaccurate. Some monochrome scanners support basic calibration.
Basic calibration reduces noise in the dynamic area and ensures
stable and clean scans. When scanning at high resolutions, even
the tiniest dust particles can cause unwanted speckles in your
output. Calibration can help reduce this kind of noise and ensure
clean scans every time.
when?
We recommend scanner maintenance once a month.
Service preventive maintenance should be performed every two
years (this has to be performed by a service engineer).
By calibrating the scanner at regular intervals (once a month), you
ensure that all files created are based on the same color scheme.
Thus, the results you get from your system are predictable, so you
don’t have to waste time and money experimenting to get the right
result.
Scanner color calibration must be performed regularly and it is
recommended to calibrate just before creating new Media Profiles
through closed loop calibration. The scanner’s calibration is crucial
for the color matching process to work properly.