HP Designjet 4000 Printer series - Manual (Page 142)

The color correction resulting from the calibration is then used for
subsequent prints on that paper type with the same print quality setting.
– Off: the printer uses a default color correction, different for each paper type
and print quality setting.
3. The printer calibrates the colors by printing a calibration strip, scanning the strip
with a built-in optical sensor, and calculating the color corrections required. The
color calibration strip is 269 mm wide, and 18 mm long when using glossy paper;
on other paper types, it is 109 mm long. Color calibration takes about three to six
minutes, depending on the paper type.
Note Color calibration can be requested manually at any time from the front
panel, by selecting the icon, then Printheads > Calibrate color.
How do I perform black point compensation?
The black point compensation option controls whether to adjust for differences in
black points when converting colors between color spaces. When this option is
selected, the full dynamic range of the source space is mapped into the full dynamic
range of the destination space. It can be very useful in preventing blocking shadows
when the black point of the source space is darker than that of the destination space.
This option is allowed only when the relative colorimetric rendering intent is selected
(see “How do I set the rendering intent?” on page 140).
Black point compensation can be specified in the following ways:
●
Using a Windows printer driver: select the Color tab, then Black point
compensation.
● Using a Mac OS printer driver: select the Color Options panel, then Black point
compensation.
● Using the Embedded Web Server: select the Submit Job page, then Black point
compensation.
●
Using the front panel: select the icon, then Printing defaults menu > Color
options > Black point compensation.
How do I set the rendering intent?
Rendering intent is one of the settings used when doing a color transformation. As
you probably know, some of the colors you want to print may not be reproducible by
the printer. The rendering intent allows you to select one of four different ways of
handling these so–called out–of–gamut colors.
●
Saturation (graphics): best used for presentation graphics, charts, or images
made up of bright, saturated colors.
● Perceptual (images): best used for photographs or images in which colors blend
together. It tries to preserve the overall color appearance.
● Relative colorimetric (proofing): best used when you want to match a particular
color. This method is mainly used for proofing. It guarantees that, if a color can be
printed accurately, it will be printed accurately. The other methods will probably
provide a more pleasing range of colors but do not guarantee that any particular
Chapter 8
140
How do
I
get
accurate
colors
from
my
printer?