For Colorimeters that rely on a calibration matrix, ccxxmake allows creation of a
correction matrix file (ccmx)
for a particular Colorimeter &
Display combination, by making use a reference Spectrometer or Colorimeter
instrument. This can then be used to improve the accuracy of
subsequent measurements with that Colorimeter on that Display by
using it with the dispcal, dispread and spotread
-X option. A ccmx file can also be installed,
and will then appear in the available display type selection (-y
option). See Wide Gamut Displays
and Colorimeters for more information on why this may be
useful. [ Note that to make
use of a colorimeter as a CCMX reference, you will have to
provide two .ti3 files rather than using interactive measurement-
see -f. ]
For Colorimeters that have sensor spectral sensitivity calibration
information built into them (ie. the X-Rite i1d3, and
DataColor Spyder4 & Spyder5),
ccxxmake allows a creation
of a calibration spectral sample (ccss)
for a particular Display,
by making use a reference Spectrometer
instrument. This can then be used to improve the accuracy of
subsequent measurements on that Display using such Colorimeters, by
using it with the dispcal, dispread and spotread
-X option, or it can be installed, and
will then appear in the available display type selection (-y
The instrument manufacturer may supply spectral sample files (see oeminst).
There is a list of contributed ccmx (Colorimeter Correction
ccxxmake -t dtech [-options]
.ti3 files rather than measure.
displayname [X11 only] Choose X11 display name
[X11 only] Choose the display from the following list (default 1),
for VideoLUT access.
Display via a web server at port (default 8080)
[MSWin] Display via MadVR Video Renderer
Display via n'th ChromeCast (default 1, ? for list)
Use telephoto mode (ie. for a projector) (if available)
Display type - instrument specific list to choose from.
Different display type for spectrometer (see -y)
Position test window and scale it
1.0 = right/bottom etc.
2.0 = double etc.
ss,vs: = optional horizontal, vertical scale.
Fill whole screen with black background
Disable initial calibration of instrument if possible
Use high resolution spectrum mode (if available)
Invoke shell "command" each time a color is set
Choose CIE Observer for CCMX spectral
1931_2 (def.), 1964_10, S&B 1955_2, shaw,
combination steps (default 3)
none, h = HW, x = Xon/Xoff
debug diagnostics to stderr
"displayname" Set display make and model
Set display technology type
CCFL Wide Gamut
CCFL Wide Gamut IPS
CCFL Wide Gamut VPA
CCFL Wide Gamut TFT
White LED IPS
White LED VPA
White LED TFT
RGB LED IPS
RGB LED VPA
RGB LED TFT
RG Phosphor IPS
RG Phosphor VPA
RG Phosphor TFT
Projector RGB Filter Wheel
Projector RGBW Filter Wheel
Projector RGBCMY Filter Wheel
Set UI selection character(s)
Override refresh, non-refresh display
Override measured refresh rate with rate Hz
Use non-adaptive integration time mode
correction.ccmx | calibration.ccss
File to save result to.
Usage Details and Discussion
The -v flag causes extra information to be
printed out during chartread operation.
default a Colorimeter Correction Matrix (CCMX) will be created from both Colorimeter and Spectrometer readings, which
allows correction for errors with a particular Colorimeter and
Display combination. If the -S
flag is used, then instead a Colorimeter Calibration Spectral Set (CCSS) file is created from just
the Spectrometer readings,
that allows calibrating any suitable Colorimeter to the Display.
-f ref.ti3[,targ.ti3] By
default ccxxmake creates a CCMX file by displaying test
patches on the screen, and then prompting you to measure them
interactively with the two instruments. An alternative is to create
a small number of test values using targen suitable for display profiling (or use the ref/ccxx.ti1 file provided with
ArgyllCMS), and then measure them with the two instruments using dispread to create a reference
and target .ti3 files, and then provide the two files as arguments
to ccxxmake -f. Normally
the reference file will be created using a spectral instrument and
you will want to use the -s
flag with dispread for this. If you want to use a colorimeter as a
reference instrument, then make sure that it is the first file
provided to the ccxxmake -f
option. The filenames should be concatenated with a "," separator without spaces.
You will also have to supply a display name using the -I option and/or technology
description using -T.
When creating a CCSS file,
only spectral readings from the display measured with the reference
instrument are needed, and a single .ti3 file should be provided.
When running on a UNIX based system that used
the X11 Windowing System, ccxxmake will by default use the
$DISPLAY environment variable to determine which display and screen
to read from. This can be overridden by supplying an X11 display
name to the -display
option. Note that if Xinerama is active, you can't select the screen
using $DISPLAY or -display, you have to select it using the -d parameter.
By default the main display will be the location of
the test window. If the system has more than one display or screen,
an alternate display/screen can be selected with the -d parameter. If you invoke ccxxmake
so as to display the usage information (i.e. "dispcal -?" or
"dispcal --"), then the discovered displays/screens will be listed.
Multiple displays may not be listed, if they appear as a single
display to the operating system (ie. the multi-display support is
hidden in the video card driver). On UNIX based system that used the
X11 Windowing System, the -d
parameter will override the screen specified by the $DISPLAY or
Because of the difficulty cause by TwinView and
MergedFB in X11 based systems, you can optionally specify a separate
display number after the display that is going to be used to present
test patches, for accessing the VideoLUT hardware. This must be
specified as a single string, e.g. -d
1,2 . Some experimentation may be needed using dispwin on such systems, to discover what
screen has access to the VideoLUT hardware, and which screens the
test patches appear on.
-dweb:port starts a
standalone web server on your machine, which then allows a local or
remote web browser to display the the color test patches. By default
port 8080 is used, but this
can be overridden by appending a :
and the port number i.e. -dweb:8001.
The URL will be http://
then name of the machine or its I.P. address followed by a colon and
the port number - e.g something like http://192.168.0.1:8080. If you use the verbose
option (-v) then a likely
URL will be printed once the server is started, or you could run ipconfig (MSWin) or /sbin/ifconfig (Linux or OS X)
and identify an internet address for your machine that way. You may
have to modify any firewall to permit port 8080 to be accessed on
[MSWin only] causes test patches to be displayed using the MadVR
video renderer. Note that will have to start MadTPG before
running ccxxmake, and that while you can adjust the "Test Pattern
Configuration" controls, you should not normally alter the
"Existing Calibration" controls, as ccxxmake will set these
-dcc or -dcc:no
causes test patches to be displayed using and available ChromeCast to
your TV. Use -dcc:? to display a list of ChromeCasts on your
local network. You may have to modify any firewall to permit port
8081 to be accessed on your machine if it falls back to the Default
The -p flag
allows measuring in telephoto mode, using instruments that support
this mode, e.g. the ColorMunki. Telephoto mode is one for taking
emissive measurements from a distance (ie. telespectometer,
tele-colorimeter) mode, and typically would be used for measuring
projector type displays. If a device does not support a specific
telephoto mode, then the normal emissive mode may be suitable for
flag allows setting the Display Type used as a base for color
correction matrix CCMX creation. Only base calibration display types
will be listed. The selection typically determines two aspects of of
the instrument operation: 1)
It may set the measuring mode to suite refresh or non-refresh displays.
Typically only LCD (Liquid Crystal) displays have a non-refresh
nature. 2) It may select an
instrument internal calibration matrix suitable for a particular
display type. The selections available depends on the type and model
of instrument, and a list of the options for the discovered
instruments will be shown in the usage
information. For more details on what particular instruments support
and how this works, see Operation of
particular instruments. Any CCMX created will work on top of
the selected Display Type, so to be valid, the same Display Type
must be selected whenever the CCMX is used with this instrument.
Installed CCMX files will automatically select the appropriate base
The -z flag allows setting a different
Display Type for the reference spectral instrument, such as refresh
or non-refresh type, if it supports it. You may have to use this if
you are setting a specific base type for the colorimeter using -y,
and the spectrometer doesn't have this display type.
parameter allows you to position and size the test patch window. By
default it is places in the center of the screen, and sized
appropriately for the type of instrument. The ho and vo values govern the horizontal
and vertical offset respectively. A value of 0.0 positions the
window to the far left or top of the screen, a value of 0.5
positions it in the center of the screen (the default), and 1.0
positions it to the far right or bottom of the screen. If three
parameters are provided, then the ss
parameter is a scale factor for the test window size. A value of 0.5
for instance, would produce a half sized window. A value of 2.0 will
produce a double size window. If four parameters are provided, then
the last two set independent horizontal and vertical scaling
factors. Note that the ho,vo,ss or ho,vo,hs,vs numbers must be
specified as a single string (no space between the numbers and the
comma). For example, to create a double sized test window at the top
right of the screen, use -P 1,0,2
. To create a window twice as wide as high: -P 1,0,2,1.
flag causes the while screen behind the test window to be masked
with black. This can aid black accuracy when measuring CRT displays
running on a UNIX based system that used the X11 Windowing System, dispcal
normally selects the override redirect so that the test window will
appear above any other windows on the display. On some systems this
can interfere with window manager operation, and the -n
option turns this behaviour off.
instrument that requires regular calibration will ask for
calibration on initial start-up. Sometimes this can be awkward if
the instrument is being mounted in some sort of measuring jig, or
annoying if several sets of readings are being taken in quick
succession. The -N
suppresses this initial calibration if a valid and not timed out
previous calibration is recorded in the instrument or on the host
computer. It is advisable to only use this option on the second and
subsequent measurements in a single session.
option on high resolution spectral mode, if the instrument supports
it, such as the Eye-One Pro. See Operation
of particular instruments for more details. This may give
better accuracy for display measurements.
The -C "command" option allows a
method of relaying each test value to some other display than that
on the system running dispcal (for instance, a photo frame, PDA
screen etc.), by causing the given command to be invoked to the
shell, with six arguments. The first three arguments are the RGB
test color as integers in the range 0 to 255, the second three
parameters are the RGB test color as floating point numbers in the
range 0.0 to 1.0. The script or tool should relay the given color to
the screen in some manner (e.g. by generating a raster file of the
given color and sending it to the display being profiled), before
returning. Note that a test window will also be created on the
system running dispread.
(CCMX creation) The -o flag allows
specifying a tristimulus observer, and is used to compute
tristimulus values from spectral readings. The following
choices are available:
1931_2 selects the standard CIE 1931 2 degree
observer. The default.
1964_10 selects the standard CIE 1964 10 degree
1955_2 selects the Stiles and Birch 1955 2 degree
1978_2 selects the Judd and Voss 1978 2 degree
shaw selects the Shaw and Fairchild 1997 2 degree
The -s steps
parameter overrides the default number of test patch combination
steps used in measuring a colorimeter & display combination. The steps are those out
of every combination of R,G & B values of the given number of
steps that have at least one colorant at 100%. So 2 steps gives 7
test patches, 3 gives 19, 4 gives 37, 5 gives 61, 6 gives 91 etc.
Note that typically this won't make much difference to the resulting
calibration, since it depends primarily on the underlying spectral
characteristics of the display.
The -W n|h|x
parameter overrides the default serial communications flow control
setting. The value n turns
all flow control off, h
sets hardware handshaking, and x
sets Xon/Xoff handshaking. This commend may be useful in workaround
serial communications issues with some systems and cables.
The -D flag causes communications and other
instrument diagnostics to be printed to stdout. A level can be set
between 1 .. 9, that may give progressively more verbose
information, depending on the instrument. This can be useful in
tracking down why an instrument can't connect.
The -E parameter allows overriding the ccmx/ccss files overall
description tag. Normally this is not necessary. With most command
line shells, it will be necessary to enclose the parameter with
double quotes, so that spaces and other special characters are
included in the parameter, and not mistaken for the start of another
flag, or as a final command line parameter.
The -I parameter allows optional setting of
the display description string in the resulting ccmx/ccss file. Since the
default display description is probably very generic, it is highly recommended that a
description of the make and model of the display be provided here.
The default or given display description will be printed before the
menu. With most command line shells, it will be necessary to enclose
the parameter with double quotes, so that spaces and other special
characters are included in the parameter, and not mistaken for the
start of another flag, or as a final command line parameters.
The -t parameter allows setting of the
display technology type from the available list. You can get a usage
that includes the list using "ccxxmake -??". This is a required
parameter, since it conveys information about the refresh type and
settling time of the display. If the specific details of the display
are not known (i.e. backlight type, pannel type etc.), then choose
the next most generic type. If none of these are applicable, choose
The -U parameter allows setting of the user
interface selection character this display type can be selected by,
if installed. This character will only be used if there is no clash
with any preceding selections. Characters in the range 0-9, A-Z a-z
can be used.
The -Y r and
-Y n options overrides the refresh display mode set by the -y display type selection, with -Y r forcing refresh display mode,
and -Y n forcing a non-refresh display mode. Not all
instruments support a display measurement refresh mode, or the
ability to override the mode set by the display type selection.
The -Y R:rate
options overrides calibration of the instrument refresh rate. This
may be useful if the instrument supports this function and the
refresh rate cannot be accurately calibrated from the display
The -Y A
option uses a non-adaptive integration time emission measurement
mode, if the instrument supports it, such as the Eye-One Pro or
ColorMunki. By default an adaptive integration time measurement mode
will be used for emission measurements, but some instruments support
a fixed integration time mode that can be used with display devices.
This may give increased consistency and faster measurement times,
but may also give less accurate low level readings.
The correction.ccmx is the name of the file to save
the resulting Colorimeter
Correction Matrix to. It is best to give it a short but
informative name that includes the Colorimeter model and the display
make and model. By convention it should have a .ccmx file extension.
The correction.ccss is the name of the file to save
the resulting Colorimeter
Calibration Spectral Samples to. It is best to give it a short
but informative name that includes the display technology or model.
By convention it should have a .ccss
If you are going to use the same CCMX or CCSS file all the time,
then you may want to set the ARGYLL_COLMTER_CAL_SPEC_SET
Unlike the other measurement utilities, ccxxmake doesn't connect to the instrument until it
is about to make a measurement. This allows for the possibility of
using a different instrument for each measurement.
It will display a menu:
Press 1 .. 4:
1) Select an instrument, Currently 1 'usb:/bus4/dev2/ (GretagMacbeth
2) Measure test patches with current instrument
3) [ Compute Colorimeter Correction Matrix & save it ]
For creating a CCMX there are two measurements to be made, after
which the correction matrix can be computed and saved. Before each
measurement, the instrument may need calibrating. For creating a
CCSS a single measurement is needed.
A spectral measurement using a spectral instrument is always
A measurement using the Colorimeter that the correction matrix
is being created for is needed in the case of creating a CCMX, but not needed when creating a CCSS.
There will be a message before the menu indicating which of the
measurements has been completed.
Because ccmx/ccss is measuring spectral matching, the exact levels
of each channel is not important, so the display settings or
calibration state shouldn't make any difference to the result, as
long as it is the same for the readings of both instruments.
Similarly, the number and variety of test patches shouldn't make a
huge difference, as long as there is at least Red, Green, Blue and
White test patches.