HP LP2480zx HP LP2480zx LCD Monitor User Guide - Page 40

Color Space Emulation, Theory of Operation

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As plotted within the 1976 CIE u'v' color space, these gamuts are shown below: Figure A-1 Color Space Diagram Color Space Emulation As noted earlier, the LP2480zx has the capability of emulating a display that conforms to a number of standard output device specifications, such as sRGB, Adobe RGB, and et cetera. This emulation includes matching the specified primaries, transfer function (gamma), white point, and, where appropriate, white level (luminance) of the target specification. Preset color spaces are provided as described earlier, and in addition, the user may program custom spaces as desired. Full custom color space programming involves the selection of primaries, white point, gamma value, and et cetera, which may be accomplished using the optional HP/X-Rite calibration tool. However, the display luminance (brightness) and white point may be adjusted using the on-screen display (OSD) or HP Display Assistant software. The following sections describe the theory behind this emulation, the hardware provided to support it in the LP2480zx, and information on its usage. Theory of Operation In general, most display devices such as CRT- or LCD-based monitors, may be mathematically modeled as comprising two functions: first, a mapping of the input values (which we will assume for this discussion are in the form of "RGB" codes, that is, the relative values of red, green, and blue levels for each pixel in the image) to the intensity of light output by the device for each (this is the display's transfer function, sometimes referred to as the gamma, for each of the three channels). This now "gamma adjusted" data must also be mapped to the specific primary colors and intensities provided by the display device for 34 Appendix A Advanced Color Management Features and Usage

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As plotted within the 1976 CIE
u
’
v
’ color space, these gamuts are shown below:
Figure A-1
Color Space Diagram
Color Space Emulation
As noted earlier, the LP2480zx has the capability of emulating a display that conforms to a number of
standard output device specifications, such as sRGB, Adobe RGB, and et cetera. This emulation
includes matching the specified primaries, transfer function (gamma), white point, and, where
appropriate, white level (luminance) of the target specification. Preset color spaces are provided as
described earlier, and in addition, the user may program custom spaces as desired. Full custom color
space programming involves the selection of primaries, white point, gamma value, and et cetera, which
may be accomplished using the optional HP/X-Rite calibration tool. However, the display luminance
(brightness) and white point may be adjusted using the on-screen display (OSD) or HP Display Assistant
software.
The following sections describe the theory behind this emulation, the hardware provided to support it in
the LP2480zx, and information on its usage.
Theory of Operation
In general, most display devices such as CRT- or LCD-based monitors, may be mathematically modeled
as comprising two functions: first, a mapping of the input values (which we will assume for this discussion
are in the form of “RGB” codes, that is, the relative values of red, green, and blue levels for each pixel
in the image) to the intensity of light output by the device for each (this is the display’s transfer function,
sometimes referred to as the gamma, for each of the three channels). This now “gamma adjusted” data
must also be mapped to the specific primary colors and intensities provided by the display device for
34
Appendix A
Advanced Color Management Features and Usage