dcmscale(1)							    OFFIS DCMTK 						       dcmscale(1)

NAME

       dcmscale - Scale DICOM images

SYNOPSIS

       dcmscale [options] dcmfile-in dcmfile-out

DESCRIPTION

       The  dcmscale  utility  reads a DICOM image, scales it according to the command line settings and writes back the DICOM image. This utility
       only supports uncompressed and RLE compressed DICOM images.

PARAMETERS

       dcmfile-in   DICOM input filename to be scaled

       dcmfile-out  DICOM output filename to be written

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
       input file format:

	 +f    --read-file
		 read file format or data set (default)

	 +fo   --read-file-only
		 read file format only

	 -f    --read-dataset
		 read data set without file meta information

       input transfer syntax:

	 -t=   --read-xfer-auto
		 use TS recognition (default)

	 -td   --read-xfer-detect
		 ignore TS specified in the file meta header

	 -te   --read-xfer-little
		 read with explicit VR little endian TS

	 -tb   --read-xfer-big
		 read with explicit VR big endian TS

	 -ti   --read-xfer-implicit
		 read with implicit VR little endian TS

   processing options
       scaling:

	 +a    --recognize-aspect
		 recognize pixel aspect ratio (default)

	 -a    --ignore-aspect
		 ignore pixel aspect ratio when scaling

	 +i    --interpolate  [n]umber of algorithm: integer
		 use interpolation when scaling (1..4, default: 1)

	 -i    --no-interpolation
		 no interpolation when scaling

	 -S    --no-scaling
		 no scaling, ignore pixel aspect ratio (default)

	 +Sxf  --scale-x-factor  [f]actor: float
		 scale x axis by factor, auto-compute y axis

	 +Syf  --scale-y-factor  [f]actor: float
		 scale y axis by factor, auto-compute x axis

	 +Sxv  --scale-x-size  [n]umber: integer
		 scale x axis to n pixels, auto-compute y axis

	 +Syv  --scale-y-size  [n]umber: integer
		 scale y axis to n pixels, auto-compute x axis

       other transformations:
	 +C    --clip-region  [l]eft [t]op [w]idth [h]eight: integer
		 clip rectangular image region (l, t, w, h)

       SOP Instance UID:

	 +ua   --uid-always
		 always assign new SOP Instance UID (default)

	 +un   --uid-never
		 never assign new SOP Instance UID

   output options
       output file format:

	 +F    --write-file
		 write file format (default)

	 -F    --write-dataset
		 write data set without file meta information

       output transfer syntax:

	 +t=   --write-xfer-same
		 write with same TS as input (default)

	 +te   --write-xfer-little
		 write with explicit VR little endian TS

	 +tb   --write-xfer-big
		 write with explicit VR big endian TS

	 +ti   --write-xfer-implicit
		 write with implicit VR little endian TS

       post-1993 value representations:

	 +u    --enable-new-vr
		 enable support for new VRs (UN/UT) (default)

	 -u    --disable-new-vr
		 disable support for new VRs, convert to OB

       group length encoding:

	 +g=   --group-length-recalc
		 recalculate group lengths if present (default)

	 +g    --group-length-create
		 always write with group length elements

	 -g    --group-length-remove
		 always write without group length elements

       length encoding in sequences and items:

	 +e    --length-explicit
		 write with explicit lengths (default)

	 -e    --length-undefined
		 write with undefined lengths

       data set trailing padding (not with --write-dataset):

	 -p=   --padding-retain
		 do not change padding
		 (default if not --write-dataset)

	 -p    --padding-off
		 no padding (implicit if --write-dataset)

	 +p    --padding-create  [f]ile-pad [i]tem-pad: integer
		 align file on multiple of f bytes and items on
		 multiple of i bytes

NOTES

       The following preferred interpolation algorithms can be selected using the --interpolate option:

       o 1 = free scaling algorithm with interpolation from pbmplus toolkit
       o 2 = free scaling algorithm with interpolation from c't magazine
       o 3 = magnification algorithm with bilinear interpolation from Eduard Stanescu
       o 4 = magnification algorithm with bicubic interpolation from Eduard Stanescu
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).
ENVIRONMENT

       The dcmscale utility will attempt to load DICOM data dictionaries specified in the DCMDICTPATH environment variable. By	default,  i.e.	if
       the  DCMDICTPATH  environment  variable	is  not  set,  the file <datadir>/dicom.dic will be loaded unless the dictionary is built into the
       application (default for Windows).
       The default behaviour should be preferred and the DCMDICTPATH environment  variable  only  used	when  alternative  data  dictionaries  are
       required. The DCMDICTPATH environment variable has the same format as the Unix shell PATH variable in that a colon (':') separates entries.
       On Windows systems, a semicolon (';') is used as a separator. The data dictionary code will attempt to load  each  file	specified  in  the
       DCMDICTPATH environment variable. It is an error if no data dictionary can be loaded.
COPYRIGHT

       Copyright (C) 2002-2010 by OFFIS e.V., Escherweg 2, 26121 Oldenburg, Germany.

Version 3.6.0							    6 Jan 2011							       dcmscale(1)