spectro/dispread
Summary
Display test patches on a monitor, read the colorimetric value result
with the colorimeter, and create the chart readings file.
Usage
dispread [-options] inoutfile
-v
Verbose mode
-d
Print debug diagnostics
-c comport Set COM port, 1..N (default 1)
-a
Run calibration
-i 92|SO Select target
instrument (default DTP92)
92
=
DTP92, SO = Spectrolino
-k file.cal
Apply
display calibration file while reading
-s
Save spectral information (default don't save)
-n
[X11 only] Don't set override redirect on test window
inoutfile
Base name for input[.ti1]/output[.ti3] file.
Examples
dispread -c1 -i92 mycrt
Comments
This is the utility for exercising a display, in order to measure its
color characteristics. The device test colors are defined by the
outfile.ti1 file, while the resulting device+colorimetric and optional
spectral readings are stored in the outfile.ti3 file. Display
calibration curves can be applied during the measurements, and the
curves included in the resulting .ti3 data file using the -kflag. See dispcal
for information on how to calibrate the display before profiling
it.
The -v flag reports progress information.
The -d flag causes serial communications
diagnostics to be printed to stdout. This can be useful in tracking
down why an instrument can't connect.
The instrument is assumed to communicate through a
serial
communication port, and the port can be selected with the -c
option,
if the instrument is not connected to the first port. If you invoke dispread so as to display the usage
information (i.e. "dispread -?" or "dispread --"), then the discovered
serial ports will be listed on Windows and Mac OSX systems.
The -a option runs through the black and sensor
relative
calibration routines for the Xrite DTP92 instrument. If a Spectrolino
is being used, then a white calibration will always be performed before
the instrument can be placed on the display.
By default dispread expects to use an Xrite
DTP92
CRT instrument, but the GretagMacbeth Spectrolino can be selected by
using the
"SO" argument to the -i option, for use on either a CRT or LCD
type of display.
By default only the colorimetric information (XYZ
value)
will be saved, but for instruments that support spectral readings (such
as
the Gretag Spectrolino), the -s option will save the spectral
readings
to the .ti3 file as well.
If a display video lookup table calibration .cal file is provided, it will be
applied to the display while the measurements are being taken, and also
included in the resulting .ti3 data file, so that profile can include it as a vcgt tag in the resulting
profile. The calibration file has usually been created using dispcal.
When running on a UNIX based system that used the X11
Windowing
System, dispread 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.
The final parameter on the command line is the base
filename for the .ti1
input file, and the .ti3 output
file. dispread will add the .ti1 and .ti3 extensions
automatically.
If a large number of patches is being read, the screensaver on many
systems can interfere with the operation of dispread. It is therefore
advisable
in these cases to manually turn off the screensaver before commencing
the
measurements.