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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 one 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 YCbCr to	RGB

	 # Never convert color space from YCbCr	to RGB during decompression.
	 # Note	that a conversion from YBR_FULL_422 to YBR_FULL	will still take
	 # place if the	source images has been compressed with subsampling.

       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.

	 +wi   --workaround-incpl
		 enable	workaround for incomplete JPEG data

	 # This	option causes dcmjpeg to ignore	incomplete JPEG	data
	 # at the end of a compressed fragment and to start decompressing
	 # the next frame from the next	fragment (if any). This	permits
	 # images with incomplete JPEG data to be decoded.

	 +wc   --workaround-cornell
		 enable	workaround for 16-bit JPEG lossless
		 Cornell images	with Huffman table overflow

	 # One of the first open-source	implementations	of lossless JPEG
	 # compression,	the "Cornell" library, has a well-known	bug that leads
	 # to invalid values in	the Huffmann table when	images with 16 bit/sample
	 # are compressed. This	flag enables a workaround that permits such
	 # images to be	decoded	correctly..fi

   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
       behavior	 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  one	 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  behavior  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)  2001-2019  by OFFIS e.V., Escherweg 2, 26121 Oldenburg,
       Germany.

Version	3.6.5			Mon Oct	28 2019			   dcmdjpeg(1)

NAME | SYNOPSIS | DESCRIPTION | PARAMETERS | OPTIONS | TRANSFER SYNTAXES | LOGGING | COMMAND LINE | ENVIRONMENT | SEE ALSO | COPYRIGHT

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