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this come from "man xcmsdb" :

SYNOPSIS

              xcmsdb [ -query ] [ -remove ] [ -format 32|16|8 ] [ filename ]

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.

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