man dcm2pnm (Commandes) - Convert DICOM images to PPM/PGM, PNG, TIFF or BMP

NAME

dcm2pnm - Convert DICOM images to PPM/PGM, PNG, TIFF or BMP

SYNOPSIS

dcm2pnm [options] dcmfile-in [pnmfile-out]

DESCRIPTION

The dcm2pnm utility reads a DICOM image, converts the pixel data according to the selected image processing options and writes back an image in the well-known PPM/PGM file format (portable pix map / portable gray map), PNG, TIFF or BMP format. This utility only supports uncompressed and RLE compressed DICOM images. The command line tool dcmj2pnm also supports a number of JPEG compression schemes.

PARAMETERS

dcmfile-in DICOM input filename to be converted

pnmfile-out output filename to be written (default: stdout)

OPTIONS

general options

-h --help print this help text and exit

--version print version information and exit

-v --verbose verbose mode, print processing details

-q --quiet quiet mode, print no warnings and errors

-d --debug debug mode, print debug information

-im --image-info info mode, print image details

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

processing options

frame selection:

+F --frame [n]umber : integer select specified frame (default: 1)

+Fr --frame-range [n]umber [c]ount : integer select c frames beginning with frame n

+Fa --all-frames select all frames

rotation:

+Rl --rotate-left rotate image left (-90 degrees)

+Rr --rotate-right rotate image right (+90 degrees)

+Rtd --rotate-top-down rotate image top-down (180 degrees)

flipping:

+Lh --flip-horizontally flip image horizontally

+Lv --flip-vertically flip image vertically

+Lhv --flip-both-axes flip image horizontally and vertically

scaling:

+a --recognize-aspect recognize pixel aspect ratio (default)

-a --ignore-aspect ignore pixel aspect ratio when scaling

+i --interpolate [n]umber of algorithm : integer use interpolation when scaling (1..2, default: 1)

-i --no-interpolation no interpolation when scaling

-S --no-scaling no scaling, ignore pixel aspect ratio (default)

+Sxf --scale-x-factor [f]actor : float scale x axis by factor, auto-compute y axis

+Syf --scale-y-factor [f]actor : float scale y axis by factor, auto-compute x axis

+Sxv --scale-x-size [n]umber : integer scale x axis to n pixels, auto-compute y axis

+Syv --scale-y-size [n]umber : integer scale y axis to n pixels, auto-compute x axis

modality LUT transformation:

-M --no-modality ignore stored modality LUT transformation

+M --use-modality use modality LUT transformation (default)

VOI LUT transformation:

-W --no-windowing no VOI windowing (default)

+Wi --use-window [n]umber : integer use the n-th VOI window from image file

+Wl --use-voi-lut [n]umber : integer use the n-th VOI look up table from image file

+Wm --min-max-window compute VOI window using min-max algorithm

+Wn --min-max-window-n compute VOI window using min-max algorithm, ignoring extreme values

+Wr --roi-min-max-window [l]eft [t]op [w]idth [h]eight : integer compute ROI window using min-max algorithm, region of interest is specified by l,t,w,h

+Wh --histogram-window [n]umber : integer compute VOI window using Histogram algorithm, ignoring n percent

+Ww --set-window [c]enter [w]idth : float compute VOI window using center c and width w

presentation LUT transformation:

+Pid --identity-shape presentation LUT shape IDENTITY

+Piv --inverse-shape presentation LUT shape INVERSE

+Pod --lin-od-shape presentation LUT shape LIN OD

overlay:

-O --no-overlays do not display overlays

+O --display-overlay [n]umber : integer display overlay n (0..16, 0=all, default: +O 0)

+Omr --ovl-replace use overlay mode "Replace" (default for Graphic overlays)

+Omt --ovl-threshold use overlay mode "Threshold Replace"

+Omc --ovl-complement use overlay mode "Complement"

+Omv --ovl-invert use overlay mode "Invert Bitmap"

+Omi --ovl-roi use overlay mode "Region of Interest" (default for ROI overlays)

+Osf --set-foreground [d]ensity : float set overlay foreground density (0..1, default: 1)

+Ost --set-threshold [d]ensity : float set overlay threshold density (0..1, default: 0.5)

display LUT transformation:

+Dm --monitor-file [f]ilename : string calibrate output according to monitor characteristics defined in f

+Dp --printer-file [f]ilename : string calibrate output according to printer characteristics defined in f

+Da --ambient-light [a]mbient light : float ambient light value (cd/m^2, default: file f)

+Di --illumination [i]llumination : float illumination value (cd/m^2, default: file f)

+Dn --min-density [m]inimum optical density : float Dmin value (default: off, only with +Dp)

+Dx --max-density [m]aximum optical density : float Dmax value (default: off, only with +Dp)

+Dg --gsd-function use GSDF for calibration (default for +Dm/+Dp)

+Dc --cielab-function use CIELAB function for calibration

compatibility options:

+Ma --accept-acr-nema accept ACR-NEMA images without photometric interpretation

+Mp --accept-palettes accept incorrect palette attribute tags (0028,111x) and (0028,121x)

+Mm --ignore-mlut-depth ignore 3rd value of the modality LUT descriptor, determine bits per table entry automatically

+Mv --ignore-vlut-depth ignore 3rd value of the VOI LUT descriptor, determine bits per table entry automatically

TIFF options:

+Tl --compr-lzw LZW compression (default)

+Tr --compr-rle RLE compression

+Tn --compr-none uncompressed

+Pd --predictor-default no LZW predictor (default)

+Pn --predictor-none LZW predictor 1 (no prediction)

+Ph --predictor-horz LZW predictor 2 (horizontal differencing)

+Rs --rows-per-strip [r]ows : integer (default: 0) rows per strip, default 8K per strip

PNG options:

+il --interlace create interlaced file (default)

-il --nointerlace create non-interlaced file

+mf --meta-file create PNG file meta information (default)

-mf --meta-none no PNG file meta information

other transformations:

+G --grayscale convert to grayscale if necessary

+P --change-polarity change polarity (invert pixel output)

+C --clip-region [l]eft [t]op [w]idth [h]eight : integer clip image region (l, t, w, h)

output options

-o --no-output do not create any output (useful with -im)

+op --write-raw-pnm write 8-bit binary PGM/PPM (default for files)

+opb --write-8-bit-pnm write 8-bit ASCII PGM/PPM (default for stdout)

+opw --write-16-bit-pnm write 16-bit ASCII PGM/PPM

+opn --write-n-bit-pnm [n]umber : integer write n-bit ASCII PGM/PPM (1..32)

+ob --write-bmp write 8-bit (monochrome) or 24-bit (color) BMP

+obp --write-8-bit-bmp write 8-bit palette BMP (monochrome only)

+obt --write-24-bit-bmp write 24-bit truecolor BMP

+ot --write-tiff write 8-bit (monochrome) or 24-bit (color) TIFF

+on --write-png write 8-bit (monochrome) or 24-bit (color) PNG

NOTES

The --write-tiff option is only available when DCMTK has been configured and compiled with support for the external libtiff TIFF library. The availability of the TIFF compression options depends on the libtiff configuration. In particular, the patented LZW algorithm may not be available.

The --write-png option is only available when DCMTK has been configured and compiled with support for the external libpng PNG library. Interlace enables progressive image view while loading the PNG file. Only a few applications take care of the metainfo (TEXT) in a png file.

Sample monitor and printer characteristics files are available in the data folder.

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 dcm2pnm 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.

FILES

share/data/camera.lut - sample characteristics file of a camera

share/data/monitor.lut - sample characteristics file of a monitor

share/data/printer.lut - sample characteristics file of a printer

share/data/scanner.lut - sample characteristics file of a scanner

SEE ALSO

COPYRIGHT

Copyright (C) 1998-2005 by Kuratorium OFFIS e.V., Escherweg 2, 26121 Oldenburg, Germany.