Description:

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).