wallPen E2 | User Manual
94
Color Management
7.3 ICC Profiles
An ICC (International Color Consortium) profile is a standardized data set that
describes the color space of a color input or color reproduction device, e.g. monitor,
printer, scanner, etc.
Colors that a printer or a monitor may not be able to display are then internally
"shifted" so that they are shown as close as possible to the desired color. This color
transfer requirements are stored in the color profile as a table. The aim is to achieve
the most constant possible color reproduction. So ICC profiles are intended to ensure
that images are reproduced as accurately as possible in color on an output device
(printer).
The printer needs to "know", how which color appears on which background to print
colors as faithfully as possible. To achieve this, ICC profiles need to be created to
correct the colors on different substrates and conditions. The approach to creating ICC
profiles for printers is to print a specific color palette on a specific background and
then read it in with a colorimeter. Thru that measuring, the software can then determine
the extent to which which hue differs from the desired hue.
7.4 Color Correction
An image in the larger RGB color space on a backlit
monitor will always look more radiant and intense than a
printed product. But how can you guarantee a certain
color accuracy despite these differences?
Especially with full control of the individual RGB colors in
the original document (e.g. 100% red) one will notice
that the CMYK color space cannot cover many color
ranges. You can counteract this on certain glossy or
coated substrates, but inkjet printing reach its limits
here.
Since every monitor - just like every printer - always displays colors slightly differently,
the screen should be well calibrated to ensure that the colors displayed correspond to
the really required colors.
For the calibration a color measuring system is necessary, like for example this i1
system of the company xrite.
To calibrate a monitor, a color measurement system software displays a certain color
on the monitor, a separate color measurement device is required to measure the color
tone from the screen, compares it with the expected color, compensates it for any
possible differences and then stores it in a compensation table. This procedure is then
automated one after the other with many different colors and takes some time. The
result is a relatively comprehensive table with many colors and the corresponding
correction values, so that colors will later be displayed as accurately as possible on the
monitor. If colors are missing in the list, the correction for these "intermediate colors"
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