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), de- compresses the JPEG data (i. e. conversion to a native DICOM transfer syn- tax) and writes the converted image to an output file (dcmfile-out). PARAMETERS dcmfile-in DICOM input filename to be converted ("-" for stdin) dcmfile-out DICOM output filename ("-" for stdout) 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. Warning: This will lead to an incorrectly decoded # image if the color space is in fact RGB. Images compressed with lossless # JPEG are almost never encoded in YCbCr, this option should thus be used # with care on such images. +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. bits stored: +bs --bits-stored-fix correct inconsistent bits stored value (default) # If the value of BitsStored in the compressed bitstream is smaller # than the value in the DICOM dataset, update the value in the dataset. -bs --bits-stored-keep preserve inconsistent bits stored value # Keep the value of BitsStored even if inconsistent with the # compressed bitstream. This may help in correctly decoding some # defective images. 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 underly- ing 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 de- tails on the different logging levels, see documentation of module 'oflog'. In case the logging output should be written to file (optionally with log- file 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 val- ues. 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 mu- tually 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 white- spaces are treated as a single separator unless they appear between two quotation marks) prior to any further evaluation. Please note that a com- mand 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 DCMDICT- PATH 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 at- tempt 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) 2001-2025 by OFFIS e.V., Escherweg 2, 26121 Oldenburg, Ger- many. Version 3.7.0 Mon Dec 15 2025 dcmdjpeg(1)
NAME | SYNOPSIS | DESCRIPTION | PARAMETERS | OPTIONS | TRANSFER SYNTAXES | LOGGING | COMMAND LINE | ENVIRONMENT | SEE ALSO | COPYRIGHT
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