XCMSDB(1) MachTen Programmer’s Manual XCMSDB(1)

NAME
xcmsdb - Device Color Characterization utility for X Color
Management System

SYNOPSIS
xcmsdb [ -query ] [ -remove ] [ -format 32|16|8 ] [ file-
name ]

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 Char-
acterization 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 speci-
fications 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 moni-
tors. 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 trans-
formed for storage in properties, provided the -query or
-remove options are not specified.

OPTIONS
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 proper-
ties 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.