HP DesignJet Z2100 GP 24 User Manual

6 Color management
●What is color?
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The problem: color in the computer world
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The solution: color management
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Color and your printer
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A summary of the color management process
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Color calibration
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Color profiling
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Color management options
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Color emulation modes
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Color adjustment options
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Color management scenarios
ENWW51
Color management
 

What is color?
We see the world around us as steeped in color, where color is in the first instance simply an aspect of
how we experience our environment. Color is therefore subjective. Upon further inspection we find that
our color experiences are closely related to brain activity that is triggered by signals sent to it by our
eyes. These signals undergo a complex and highly interlinked sequence of processing stages that make
the relationship between what our eyes emit and what we experience anything...

To control the output of color imaging devices, the following color spaces are normally used:
●RGB (Red, Green, and Blue) is the color space typically used for additive devices. A color is
represented as a combination of specific quantities of red, green, and blue colorants and all such
combinations address the range of colors (color gamut) of the chosen device.
NOTESubtractive devices can also be controlled using RGB data and, especially when
you do not require control over how you want to use your...

1.All colors
2.Computer monitor gamut
3.CMYK press gamut
Finally, there are some color spaces that are not device-dependent, but instead represent how a viewer
sees colors, such as CIE Lab or CIECAM02 defined by the CIE (Commission Internationale de
l’Éclairage). The advantage of these spaces is that, unlike CMYK or RGB, if two objects have the same
CIE Lab values then they will look the same when viewed under the same conditions. Values in these
spaces can be obtained from measuring the light emitted or...

●CMS: CMS stands for Color Management System. It is the application that converts the color
information stored in the input image, which has the color space defined by a source profile, into
an output image that has the color space specified by a destination profile. There are many different
CMSs on the market: there are CMSs in applications, in operating systems, and in printing software
provided by printer manufacturers (in our case the HP Designjet Z2100 internal RIP).
●Source profile: a description...

an RGB ICC profile, describing its color behavior for the paper that was loaded at the time of
measuring.
●CMYK mode:
●SWOP: abbreviation of “Specifications for Web Offset Publications”, a set of press standards
defined for a typical US press and for different types of paper
●ISO 12647-2: a set of press standards defined by the International Standards Organization
for different types of paper (Coated, Uncoated, …)
●Other regional standards: Euroscale, JMPA, Japan Color
●Specific CMYK device space: for...

A summary of the color management process
To get the accurate and consistent colors that you want, you should follow these steps for each paper
type that you use.
1.If your paper type is not already known to the printer, add it to the printers list of known papers.
Typical users may add a few custom paper types every year.
2.Color-calibrate the paper type, for consistent colors. Calibration should be repeated every now and
then, when recommended by a printer alert (typically, every few weeks for each...

NOTEYou can perform all three operations in sequence as shown, but you can also choose
to start with or stop after any of the three operations. With one exception: color calibration is
performed automatically after adding a new paper type.
Color calibration
Color calibration enables your printer to produce consistent colors with the particular printheads, inks,
and paper type that you are using, and under your particular environmental conditions. After color
calibration, you can expect to get identical...

The calibration process is fully automatic and can be performed unattended after you have loaded paper
of the type you wish to calibrate—which should be A4, Letter, or any larger size.
The process takes about 8–10 minutes and consists of the following steps.
1.A calibration test chart is printed, which contains patches of each ink used in your printer.
2.The test chart is allowed to dry for a period of time that depends on the paper type, so that the
colors have time to stabilize.
3.The test chart is...

The printer chooses automatically between two profile charts:
●An A3 or B format for cut sheets
●A roll-paper format that minimizes paper use by printing across the full width of the roll
2.The test chart is allowed to dry for a period of time that depends on the paper type, so that the
colors have time to stabilize.
NOTEIf you would like to use a longer drying time, you can ask the HP Color Center to
create the test chart without going on to create a profile (Windows: Print target only; Mac
OS: Print...