dcmdspfn(1) OFFIS DCMTK dcmdspfn(1)
NAME
dcmdspfn - Export standard display curves to a text file
SYNOPSIS
dcmdspfn [options]
DESCRIPTION
Command line program converts a DCMTK monitor / camera / printer /
scanner characteristics file to tabbed text file describing the
characteristic curve (CC), the display function and the post-
standardized curve (PSC) for an 8 bit display. The 256 values of each
curve can be visualized by a common spread sheet program. Above that
the display curve (without CC and PSC) can also be computed for a
specified luminance/OD range (min/max) and a certain number of Digital
Driving Levels (DDL).
PARAMETERS
dcmfile-in DICOM input filename to be dumped
OPTIONS
general options
-h --help
print this help text and exit
--version
print version information and exit
--arguments
print expanded command line arguments
-q --quiet
quiet mode, print no warnings and errors
-v --verbose
verbose mode, print processing details
-d --debug
debug mode, print debug information
-ll --log-level [l]evel: string constant
(fatal, error, warn, info, debug, trace)
use level l for the logger
-lc --log-config [f]ilename: string
use config file f for the logger
input options (mutually exclusive)
+Im --monitor-file [f]ilename: string
text file describing the monitor characteristics
+Ic --camera-file [f]ilename: string
text file describing the camera characteristics
+Ip --printer-file [f]ilename: string
text file describing the printer characteristics
+Is --scanner-file [f]ilename: string
text file describing the scanner characteristics
+Il --lum-range [m]in max: float
minimum and maximum luminance (cd/m^2)
+Io --od-range [m]in max: float
minimum and maximum optical density (OD),
automatically converted to luminance
creation options
+Ca --ambient-light [a]mbient light: float
ambient light value (cd/m^2, default: file f)
+Ci --illumination [i]llumination: float
illumination value (cd/m^2, default: file f)
+Dn --min-density [m]inimum optical density: float
Dmin value (default: off, only with +Ip and +Io)
+Dx --max-density [m]aximum optical density: float
Dmax value (default: off, only with +Ip and +Io)
+Cd --ddl-count [n]umber of DDLs: integer
number of Digital Driving Levels
(default: 256, only with --lum/od-range)
+Cf --curve-fitting [n]umber: integer
use polynomial curve fitting algorithm with order n
(0..99, default: file setting or cubic spline)
output options
+Og --gsdf [f]ilename: string
write GSDF curve data to file f
+Oc --cielab [f]ilename: string
write CIELAB curve data to file f
NOTES
The output file describing the CC, GSDF or CIELAB and PSC for an 8 bit
display system (monitor, camera, printer or scanner) is a simple text
file. Lines starting with a '#' are treated as comments and, therefore,
skipped as well as blank lines. An input file can for instance be
created by the command line tool dconvlum.
The ambient light value possibly defined in the characteristics file is
also used for the calculation. In this case the value is part of the
file comment header as well as the number of DDL (digital driving
level) values, the absolute luminance range (measured in candela per
square meter) and the range of the JND index (just noticeable
difference) in case of GSDF. Alternatively, the ambient light value can
be specified as a command line option. When setting the two luminance
values instead of reading a monitor characteristic file as input the
luminance range is linearly divided by the number of DDLs.
For printers and scanners the illumination can be specified in addition
to the reflected ambient light (both in the characteristics file and on
the command line). The header of the output file includes the minimum
and maximum Optical Density (OD) instead of the luminance range. Please
note that the OD values in the input file have to be ordered in
descending order (in contrast to the luminance values used for monitors
and cameras). The DDL value 0 always means black (darkest value) and
the maximum DDL value means white (brightest value, clear film).
The data folder contains sample characteristics file for monitors,
cameras, printers and scanners. See DICOM standard part 14 for more
details on display calibration and Barten's model (including GSDF).
LOGGING
The level of logging output of the various command line tools and
underlying libraries can be specified by the user. By default, only
errors and warnings are written to the standard error stream. Using
option --verbose also informational messages like processing details
are reported. Option --debug can be used to get more details on the
internal activity, e.g. for debugging purposes. Other logging levels
can be selected using option --log-level. In --quiet mode only fatal
errors are reported. In such very severe error events, the application
will usually terminate. For more details on the different logging
levels, see documentation of module 'oflog'.
In case the logging output should be written to file (optionally with
logfile rotation), to syslog (Unix) or the event log (Windows) option
--log-config can be used. This configuration file also allows for
directing only certain messages to a particular output stream and for
filtering certain messages based on the module or application where
they are generated. An example configuration file is provided in
<etcdir>/logger.cfg.
COMMAND LINE
All command line tools use the following notation for parameters:
square brackets enclose optional values (0-1), three trailing dots
indicate that multiple values are allowed (1-n), a combination of both
means 0 to n values.
Command line options are distinguished from parameters by a leading '+'
or '-' sign, respectively. Usually, order and position of command line
options are arbitrary (i.e. they can appear anywhere). However, if
options are mutually exclusive the rightmost appearance is used. This
behavior conforms to the standard evaluation rules of common Unix
shells.
In addition, one or more command files can be specified using an '@'
sign as a prefix to the filename (e.g. @command.txt). Such a command
argument is replaced by the content of the corresponding text file
(multiple whitespaces are treated as a single separator unless they
appear between two quotation marks) prior to any further evaluation.
Please note that a command file cannot contain another command file.
This simple but effective approach allows one to summarize common
combinations of options/parameters and avoids longish and confusing
command lines (an example is provided in file <datadir>/dumppat.txt).
FILES
<datadir>/camera.lut - sample characteristics file of a camera
<datadir>/monitor.lut - sample characteristics file of a monitor
<datadir>/printer.lut - sample characteristics file of a printer
<datadir>/scanner.lut - sample characteristics file of a scanner
SEE ALSO
dconvlum(1), dcod2lum(1)
COPYRIGHT
Copyright (C) 1999-2022 by OFFIS e.V., Escherweg 2, 26121 Oldenburg,
Germany.
Version 3.6.7 Fri Apr 22 2022 dcmdspfn(1)