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
Device 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
+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 Device 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 (device driving level) values, the
absolute luminance range (measured in candela per square meter) and the range
of the JND index (just noticable 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 behaviour 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 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) 1999-2010 by OFFIS e.V., Escherweg 2, 26121 Oldenburg,
Germany.
