xcmsdb - Device Color Characterization utility for X Color Management System
xcmsdb [ -query ] [ -remove ] [
  -format 32|16|8 ] [ -help ] [
  -version ] [ 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 properties.
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.
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 out.
- -remove
- This option attempts to remove the XDCCC properties on the screen's root
      window.
- -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.
- -help
- This option prints a summary of the available options and exits.
- -version
- This option prints the program version and exits.
xprop(1), Xlib documentation
  - DISPLAY
- to figure out which display and screen to use.
Chuck Adams, Tektronix Inc. Al Tabayoyon, SynChromatics Inc. (added multi-visual
  support)