dcmcjpls(1) OFFIS DCMTK dcmcjpls(1) NAME dcmcjpls - Encode DICOM file to JPEG-LS transfer syntax SYNOPSIS dcmcjpls [options] dcmfile-in dcmfile-out DESCRIPTION The dcmcjpls utility reads an uncompressed DICOM image (dcmfile-in), per- forms a JPEG-LS compression (i. e. conversion to an encapsulated DICOM transfer syntax) 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 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 JPEG-LS encoding options JPEG-LS process: +el --encode-lossless encode JPEG-LS lossless only TS (default) # This options selects the JPEG-LS lossless only transfer syntax # and performs a lossless compression. +en --encode-nearlossless encode JPEG-LS near-lossless TS (NEAR: 2) # This options selects the JPEG-LS lossy transfer syntax # and performs a near-lossless compression. JPEG-LS bit rate (near-lossless only): +md --max-deviation [d]eviation: integer (default: 2) defines maximum deviation for an encoded pixel # This option specifies the maximum deviation for a single pixel from # the original pixel value. lossless compression: +pr --prefer-raw prefer raw encoder mode (default) # This option enables the raw encoder. The raw encoder encodes the # complete pixel cell as it was read from the source image without # performing any modifications. +pc --prefer-cooked prefer cooked encoder mode # This option enables the cooked encoder. The cooked encoder moves # overlay data to separate tags (60xx,3000) and only encodes the # stored bits in each pixel. JPEG-LS compression: +t1 --threshold1 [t]hreshhold: integer set JPEG-LS encoding parameter threshold 1 +t2 --threshold2 [t]hreshhold: integer set JPEG-LS encoding parameter threshold 2 +t3 --threshold3 [t]hreshhold: integer set JPEG-LS encoding parameter threshold 3 # By default, the values for T1, T2, T3 are computed based on # the number of bits per sample. +rs --reset [r]eset: integer (default: 64) set JPEG-LS encoding parameter reset JPEG-LS interleave: +il --interleave-line force line-interleaved JPEG-LS images (default) # This flag forces line-interleaved mode for the resulting image. # In line-interleave mode each line from the source image is # compressed separately for each component and then the next line # is encoded. +is --interleave-sample force sample-interleaved JPEG-LS images # This flag forces sample-interleaved mode for the resulting image. # In sample-interleave mode each pixel's components are encoded before # the next pixel is encoded. +iv --interleave-default use the fastest possible interleave mode # This flag selects an interleave mode based on the source image's mode. # If possible, the image is not converted to a different interleave mode. JPEG-LS padding of odd-length bitstreams: +ps --padding-standard pad with extended EOI marker (default) # Pad odd-length JPEG-LS bitstreams by writing an extended end of image # segment marker FF FF D9, as required by the DICOM standard. +pz --padding-zero pad with zero byte (non-standard) # Pad odd-length JPEG-LS bitstreams by writing a zero byte after the # end of image segment marker, i.e. FF D9 00. This is not DICOM conformant # but required for interoperability with the HP LOCO reference implementation, # which does not support extended JPEG-LS bitstreams. encapsulated pixel data encoding options encapsulated pixel data fragmentation: +ff --fragment-per-frame encode each frame as one fragment (default) # This option causes the creation of one compressed fragment for each # frame (recommended). +fs --fragment-size [s]ize: integer limit fragment size to s kbytes # This option limits the fragment size which may cause the creation of # multiple fragments per frame. basic offset table encoding: +ot --offset-table-create create offset table (default) # This option causes the creation of a valid offset table for the # compressed JPEG fragments. -ot --offset-table-empty leave offset table empty # This option causes the creation of an empty offset table # for the compressed JPEG fragments. SOP Class UID: +cd --class-default keep SOP Class UID (default) # Keep the SOP Class UID of the source image. +cs --class-sc convert to Secondary Capture Image (implies --uid-always) # Convert the image to Secondary Capture. In addition to the SOP Class # UID, all attributes required for a valid secondary capture image are # added. A new SOP instance UID is always assigned. SOP Instance UID: +ud --uid-default assign new UID if lossy compression (default) # Assigns a new SOP instance UID if the compression is lossy JPEG-LS. +ua --uid-always always assign new UID # Unconditionally assigns a new SOP instance UID. +un --uid-never never assign new UID # Never assigns a new SOP instance UID. output options 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: -p= --padding-retain do not change padding (default) -p --padding-off no padding +p --padding-create [f]ile-pad [i]tem-pad: integer align file on multiple of f bytes and items on multiple of i bytes NOTES The dcmcjpls utility compresses DICOM images of all SOP classes. It processes all Pixel Data (7fe0,0010) elements in the dataset, i.e. compres- sion is also performed on an icon image. However, dcmcjpls does not attempt to ensure that the compressed image still complies with all restrictions of the object's IOD. The user is responsible for making sure that the compressed images he cre- ates are compliant with the DICOM standard. If in question, the dcmcjpls utility allows one to convert an image to secondary capture - this SOP class does not pose restrictions as the ones mentioned above. TRANSFER SYNTAXES dcmcjpls 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 (*) if compiled with zlib support enabled dcmcjpls supports the following transfer syntaxes for output (dcmfile-out): JPEGLSLosslessTransferSyntax 1.2.840.10008.1.2.4.80 JPEGLSLossyTransferSyntax 1.2.840.10008.1.2.4.81 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 dcmcjpls 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 dcmdjpls(1) COPYRIGHT Copyright (C) 2009-2025 by OFFIS e.V., Escherweg 2, 26121 Oldenburg, Ger- many. Version 3.7.0 Mon Dec 15 2025 dcmcjpls(1)
NAME | SYNOPSIS | DESCRIPTION | PARAMETERS | OPTIONS | NOTES | TRANSFER SYNTAXES | LOGGING | COMMAND LINE | ENVIRONMENT | SEE ALSO | COPYRIGHT
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