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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) 1999-2024 by OFFIS	e.V., Escherweg	 2,  26121  Oldenburg,
       Germany.

Version	3.6.9			Wed Dec	11 2024			   dcmdspfn(1)

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