man dcmdjpeg (Commandes) - Decode JPEG-compressed DICOM file
NAME
dcmdjpeg - Decode JPEG-compressed DICOM file
SYNOPSIS
dcmdjpeg [options] dcmfile-in dcmfile-out
DESCRIPTION
The dcmdjpeg utility reads a JPEG-compressed DICOM image (dicomfile-in), decompresses the JPEG data (i. e. conversion to a native DICOM transfer syntax) and writes the converted image to an output file (dicomfile-out).
PARAMETERS
dcmfile-in DICOM input filename to be converted
dcmfile-out DICOM output filename
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
# This option allows to decompress JPEG compressed DICOM objects that have # been stored as dataset without meta-header. Such a thing should not exist # since the transfer syntax cannot be reliably determined without meta-header, # but unfortunately it does.
processing options
color space conversion options:
+cp --conv-photometric convert if YCbCr photom. interpr. (default)
# If the compressed image uses YBR_FULL or YBR_FULL_422 photometric # interpretation, convert to RGB during decompression.
+cl --conv-lossy convert YCbCr to RGB if lossy JPEG
# If the compressed image is encoded in lossy JPEG, assume YCbCr # color model and convert to RGB.
+ca --conv-always always convert YCbCr to RGB
# If the compressed image is a color image, assume YCbCr color model # and convert to RGB.
+cn --conv-never never convert color space
# Never convert color space during decompression.
planar configuration options:
+pa --planar-auto automatically determine planar configuration from SOP class and color space (default)
# If the compressed image is a color image, store in color-by-plane # planar configuration if required by the SOP class and photometric # interpretation. Hardcopy Color images are always stored color-by- # plane, and the revised Ultrasound image objects are stored color-by- # plane if the color model is YBR_FULL. Everything else is stored # color-by-pixel.
+px --color-by-pixel always store color-by-pixel
# If the compressed image is a color image, store in color-by-pixel # planar configuration.
+pl --color-by-plane always store color-by-plane
# If the compressed image is a color image, store in color-by-plane # planar configuration.
SOP Instance UID options:
+ud --uid-default keep same SOP Instance UID (default)
# Never assigns a new SOP instance UID.
+ua --uid-always always assign new UID
# Always assigns a 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:
+te --write-xfer-little write with explicit VR little endian (default)
+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 dcmdjpeg 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.
SEE ALSO
COPYRIGHT
Copyright (C) 2001-2005 by Kuratorium OFFIS e.V., Escherweg 2, 26121 Oldenburg, Germany.