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xcmsdb - Device Color Characterization utility
for X Color Management System
xcmsdb [ -query ] [ -remove ] [ -format
32|16|8 ] [ filename ]
xcmsdb is used to load, query, or remove
Device Color Characterization data stored in properties on the root window
of the screen as specified in section 7, Device Color Characterization,
of the ICCCM. Device Color Characterization data (also called the Device
Profile) is an integral part of Xlib's X Color Management System (Xcms),
necessary for proper conversion of color specification between device-independent
and device-dependent forms. Xcms uses 3x3 matrices stored in the XDCCC_LINEAR_RGB_MATRICES
property to convert color specifications between CIEXYZ and RGB Intensity
(XcmsRGBi, also referred to as linear RGB). Xcms then uses display gamma
information stored in the XDCCC_LINEAR_RGB_CORRECTION property to convert
color specifications between RGBi and RGB device (XcmsRGB, also referred
to as device RGB).
Note that Xcms allows clients to register function sets
in addition to its built-in function set for CRT color monitors. Additional
function sets may store their device profile information in other properties
in function set specific format. This utility is unaware of these non-standard
The ASCII readable contents of filename (or the standard input
if no input file is given) are appropriately transformed for storage in
properties, provided the -query or -remove options are not specified.
program accepts the following options:
, Xlib documentation
- This option attempts to read
the XDCCC properties off the screen's root window. If successful, it transforms
the data into a more readable format, then sends the data to standard out.
- This option attempts to remove the XDCCC properties on the screen's
- -format 32|16|8
- Specifies the property format (32, 16, or 8 bits
per entry) for the XDCCC_LINEAR_RGB_CORRECTION property. Precision of encoded
floating point values increases with the increase in bits per entry. The
default is 32 bits per entry.
Chuck Adams, Tektronix
Inc. Al Tabayoyon, SynChromatics Inc. (added multi-visual support)
- to figure out which display and screen to use.
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