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
-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.

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