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dcmscale

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
 
   -v    --verbose
           verbose mode, print processing details
 
   -d    --debug
           debug mode, print debug information
 

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..2, 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 options:
 
   +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
 

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).

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 <PREFIX>/lib/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. 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) 2002-2005 by Kuratorium OFFIS e.V., Escherweg 2, 26121 Oldenburg, Germany.