1dcmscale(1)                       OFFIS DCMTK                      dcmscale(1)
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NAME

6       dcmscale - Scale DICOM images
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SYNOPSIS

10       dcmscale [options] dcmfile-in dcmfile-out
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DESCRIPTION

13       The  dcmscale  utility  reads a DICOM image, scales it according to the
14       command line settings and writes back the  DICOM  image.  This  utility
15       only supports uncompressed and RLE compressed DICOM images.
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PARAMETERS

18       dcmfile-in   DICOM input filename to be scaled
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20       dcmfile-out  DICOM output filename to be written
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OPTIONS

23   general options
24         -h    --help
25                 print this help text and exit
26
27               --version
28                 print version information and exit
29
30               --arguments
31                 print expanded command line arguments
32
33         -q    --quiet
34                 quiet mode, print no warnings and errors
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36         -v    --verbose
37                 verbose mode, print processing details
38
39         -d    --debug
40                 debug mode, print debug information
41
42         -ll   --log-level  [l]evel: string constant
43                 (fatal, error, warn, info, debug, trace)
44                 use level l for the logger
45
46         -lc   --log-config  [f]ilename: string
47                 use config file f for the logger
48
49   input options
50       input file format:
51
52         +f    --read-file
53                 read file format or data set (default)
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55         +fo   --read-file-only
56                 read file format only
57
58         -f    --read-dataset
59                 read data set without file meta information
60
61       input transfer syntax:
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63         -t=   --read-xfer-auto
64                 use TS recognition (default)
65
66         -td   --read-xfer-detect
67                 ignore TS specified in the file meta header
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69         -te   --read-xfer-little
70                 read with explicit VR little endian TS
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72         -tb   --read-xfer-big
73                 read with explicit VR big endian TS
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75         -ti   --read-xfer-implicit
76                 read with implicit VR little endian TS
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78   image processing and encoding options
79       scaling:
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81         +a    --recognize-aspect
82                 recognize pixel aspect ratio when scaling (default)
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84         -a    --ignore-aspect
85                 ignore pixel aspect ratio when scaling
86
87         +i    --interpolate  [n]umber of algorithm: integer
88                 use interpolation when scaling (1..4, default: 1)
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90         -i    --no-interpolation
91                 no interpolation when scaling
92
93         -S    --no-scaling
94                 no scaling, ignore pixel aspect ratio (default)
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96         +Sxf  --scale-x-factor  [f]actor: float
97                 scale x axis by factor, auto-compute y axis
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99         +Syf  --scale-y-factor  [f]actor: float
100                 scale y axis by factor, auto-compute x axis
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102         +Sxv  --scale-x-size  [n]umber: integer
103                 scale x axis to n pixels, auto-compute y axis
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105         +Syv  --scale-y-size  [n]umber: integer
106                 scale y axis to n pixels, auto-compute x axis
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108       other transformations:
109
110         +C    --clip-region  [l]eft [t]op [w]idth [h]eight: integer
111                 clip rectangular image region (l, t, w, h)
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113       SOP Instance UID:
114
115         +ua   --uid-always
116                 always assign new SOP Instance UID (default)
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118         +un   --uid-never
119                 never assign new SOP Instance UID
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121   output options
122       output file format:
123
124         +F    --write-file
125                 write file format (default)
126
127         -F    --write-dataset
128                 write data set without file meta information
129
130       output transfer syntax:
131
132         +t=   --write-xfer-same
133                 write with same TS as input (default)
134
135         +te   --write-xfer-little
136                 write with explicit VR little endian TS
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138         +tb   --write-xfer-big
139                 write with explicit VR big endian TS
140
141         +ti   --write-xfer-implicit
142                 write with implicit VR little endian TS
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144       post-1993 value representations:
145
146         +u    --enable-new-vr
147                 enable support for new VRs (UN/UT) (default)
148
149         -u    --disable-new-vr
150                 disable support for new VRs, convert to OB
151
152       group length encoding:
153
154         +g=   --group-length-recalc
155                 recalculate group lengths if present (default)
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157         +g    --group-length-create
158                 always write with group length elements
159
160         -g    --group-length-remove
161                 always write without group length elements
162
163       length encoding in sequences and items:
164
165         +e    --length-explicit
166                 write with explicit lengths (default)
167
168         -e    --length-undefined
169                 write with undefined lengths
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171       data set trailing padding (not with --write-dataset):
172
173         -p=   --padding-retain
174                 do not change padding
175                 (default if not --write-dataset)
176
177         -p    --padding-off
178                 no padding (implicit if --write-dataset)
179
180         +p    --padding-create  [f]ile-pad [i]tem-pad: integer
181                 align file on multiple of f bytes and items on
182                 multiple of i bytes
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NOTES

185       The  following preferred interpolation algorithms can be selected using
186       the --interpolate option:
187
188       • 1 = free scaling algorithm with interpolation from pbmplus toolkit
189       • 2 = free scaling algorithm with interpolation from c't magazine
190       • 3 = magnification algorithm with bilinear interpolation  from  Eduard
191         Stanescu
192       • 4  =  magnification  algorithm with bicubic interpolation from Eduard
193         Stanescu

LOGGING

195       The level of logging output of  the  various  command  line  tools  and
196       underlying  libraries  can  be  specified by the user. By default, only
197       errors and warnings are written to the  standard  error  stream.  Using
198       option  --verbose  also  informational messages like processing details
199       are reported. Option --debug can be used to get  more  details  on  the
200       internal  activity,  e.g.  for debugging purposes. Other logging levels
201       can be selected using option --log-level. In --quiet  mode  only  fatal
202       errors  are reported. In such very severe error events, the application
203       will usually terminate. For  more  details  on  the  different  logging
204       levels, see documentation of module 'oflog'.
205       In  case  the logging output should be written to file (optionally with
206       logfile rotation), to syslog (Unix) or the event log  (Windows)  option
207       --log-config  can  be  used.  This  configuration  file also allows for
208       directing only certain messages to a particular output stream  and  for
209       filtering  certain  messages  based  on the module or application where
210       they are generated.  An  example  configuration  file  is  provided  in
211       <etcdir>/logger.cfg.

COMMAND LINE

213       All  command  line  tools  use  the  following notation for parameters:
214       square brackets enclose optional  values  (0-1),  three  trailing  dots
215       indicate  that multiple values are allowed (1-n), a combination of both
216       means 0 to n values.
217       Command line options are distinguished from parameters by a leading '+'
218       or  '-' sign, respectively. Usually, order and position of command line
219       options are arbitrary (i.e. they  can  appear  anywhere).  However,  if
220       options  are  mutually exclusive the rightmost appearance is used. This
221       behavior conforms to the  standard  evaluation  rules  of  common  Unix
222       shells.
223       In  addition,  one  or more command files can be specified using an '@'
224       sign as a prefix to the filename (e.g. @command.txt).  Such  a  command
225       argument  is  replaced  by  the  content of the corresponding text file
226       (multiple whitespaces are treated as a  single  separator  unless  they
227       appear  between  two  quotation marks) prior to any further evaluation.
228       Please note that a command file cannot contain  another  command  file.
229       This  simple  but  effective  approach  allows  one to summarize common
230       combinations of options/parameters and  avoids  longish  and  confusing
231       command lines (an example is provided in file <datadir>/dumppat.txt).

ENVIRONMENT

233       The  dcmscale  utility  will  attempt  to  load DICOM data dictionaries
234       specified in the DCMDICTPATH environment variable. By default, i.e.  if
235       the   DCMDICTPATH   environment   variable   is   not   set,  the  file
236       <datadir>/dicom.dic will be loaded unless the dictionary is built  into
237       the application (default for Windows).
238       The   default   behavior   should  be  preferred  and  the  DCMDICTPATH
239       environment variable only used when alternative data  dictionaries  are
240       required.  The  DCMDICTPATH environment variable has the same format as
241       the Unix shell PATH variable in that a colon (':')  separates  entries.
242       On  Windows systems, a semicolon (';') is used as a separator. The data
243       dictionary code will  attempt  to  load  each  file  specified  in  the
244       DCMDICTPATH  environment variable. It is an error if no data dictionary
245       can be loaded.
247       Copyright (C) 2002-2022 by OFFIS e.V., Escherweg  2,  26121  Oldenburg,
248       Germany.
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252Version 3.6.7                   Fri Apr 22 2022                    dcmscale(1)
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