dcmscale(1) OFFIS DCMTK dcmscale(1)NAMEdcmscale - Scale DICOM images
SYNOPSISdcmscale [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:
· 1 = free scaling algorithm with interpolation from pbmplus toolkit
· 2 = free scaling algorithm with interpolation from c't magazine
· 3 = magnification algorithm with bilinear interpolation from Eduard
Stanescu
· 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)
