xcmsdb - Device Color Characterization utility for X Color Management
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-
The ASCII readable contents of filename (or the standard input if no
input file is given) are appropriately transformed for storage in prop-
erties, provided the -query or -remove options are not specified.
xcmsdb program accepts the following options:
-query 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
-remove This option attempts to remove the XDCCC properties on the
screen’s root window.
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.
xprop(1), Xlib documentation
DISPLAY to figure out which display and screen to use.
Chuck Adams, Tektronix Inc. Al Tabayoyon, SynChromatics Inc. (added
Man(1) output converted with