dcmdjpeg(1)                       OFFIS DCMTK                      dcmdjpeg(1)



NAME
       dcmdjpeg - Decode JPEG-compressed DICOM file

SYNOPSIS
       dcmdjpeg [options] dcmfile-in dcmfile-out


DESCRIPTION
       The  dcmdjpeg utility reads a JPEG-compressed DICOM image (dcmfile-in),
       decompresses the JPEG data (i. e. conversion to a native DICOM transfer
       syntax) and writes the converted image to an output file (dcmfile-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

               --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

         # 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:

         +cp   --conv-photometric
                 convert if YCbCr photometric interpretation (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.

         +cg   --conv-guess
                 convert to RGB if YCbCr is guessed by library

         # If the underlying JPEG library "guesses" the color space of the
         # compressed image to be YCbCr, convert to RGB.

         +cgl  --conv-guess-lossy
                 convert to RGB if lossy JPEG and YCbCr is
                 guessed by the underlying JPEG library

         # If the compressed image is encoded in lossy JPEG and the underlying
         # JPEG library "guesses" the color space to be YCbCr, 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:

         +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:

         +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.

       workaround options for incorrect JPEG encodings:

         +w6   --workaround-pred6
                 enable workaround for JPEG lossless images
                 with overflow in predictor 6

         # DICOM images with 16 bits/pixel have been observed "in the wild"
         # that are compressed with lossless JPEG and need special handling
         # because the encoder produced an 16-bit integer overflow in predictor
         # 6, which needs to be compensated (reproduced) during decompression.
         # This flag enables a correct decompression of such faulty images, but
         # at the same time will cause an incorrect decompression of correctly
         # compressed images. Use with care.


   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


TRANSFER SYNTAXES
       dcmdjpeg supports the following transfer syntaxes for  input  (dcmfile-
       in):



       LittleEndianImplicitTransferSyntax             1.2.840.10008.1.2
       LittleEndianExplicitTransferSyntax             1.2.840.10008.1.2.1
       DeflatedExplicitVRLittleEndianTransferSyntax   1.2.840.10008.1.2.1.99 (*)
       BigEndianExplicitTransferSyntax                1.2.840.10008.1.2.2
       JPEGProcess1TransferSyntax                     1.2.840.10008.1.2.4.50
       JPEGProcess2_4TransferSyntax                   1.2.840.10008.1.2.4.51
       JPEGProcess6_8TransferSyntax                   1.2.840.10008.1.2.4.53
       JPEGProcess10_12TransferSyntax                 1.2.840.10008.1.2.4.55
       JPEGProcess14TransferSyntax                    1.2.840.10008.1.2.4.57
       JPEGProcess14SV1TransferSyntax                 1.2.840.10008.1.2.4.70


       (*) if compiled with zlib support enabled

       dcmdjpeg  supports the following transfer syntaxes for output (dcmfile-
       out):



       LittleEndianImplicitTransferSyntax             1.2.840.10008.1.2
       LittleEndianExplicitTransferSyntax             1.2.840.10008.1.2.1
       BigEndianExplicitTransferSyntax                1.2.840.10008.1.2.2


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  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
       <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.

SEE ALSO
       dcmcjpeg(1)

COPYRIGHT
       Copyright (C) 2001-2010 by OFFIS e.V., Escherweg  2,  26121  Oldenburg,
       Germany.



Version 3.6.0                     6 Jan 2011                       dcmdjpeg(1)
