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
-q --quiet
quiet mode, print no warnings and errors
-d --debug
debug mode, print debug information
input options
+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).
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) 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
share/data/dumppat.txt).
FILES
share/data/camera.lut - sample characteristics file of a camera
share/data/monitor.lut - sample characteristics file of a monitor
share/data/printer.lut - sample characteristics file of a printer
share/data/scanner.lut - sample characteristics file of a scanner
SEE ALSO
dconvlum(1), dcod2lum(1)
COPYRIGHT
Copyright (C) 1999-2004 by Kuratorium OFFIS e.V., Escherweg 2, 26121
Oldenburg, Germany.