SYNOPSIS

dctopgm8

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[ -v|verbose ] [ -quiet|silent ] -windowwidth width ] -windowlevel|windowcenter center ] -ignorewindow ] -voilut numberfromzero ] -ignorevoilut ] -invertedgray ] -signed|unsigned ]

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DESCRIPTION

dctopgm8

reads the named dicom or acr-nema input file, converts it to an 8 bit grayscale image by windowing or application of a VOI LUT and saves it as a PGM file.

In the absence of overriding command line options, the default behavior is to apply the first VOI LUT found, else if none, the first pair of window values in the input file, else if none, the full range of the input pixel values.

The input file must be unencapsulated.

OPTIONS

The PGM output goes where it is specified or standard out. The verbose output goes to standard error.

The basic input switches are described in dcintro(1). Options specific to this program are:

-quiet|silent

Suppress the normal description of image parameters.

-verbose

Display byte offset from file start and message start, in hexadecimal, and dump contents while reading, once read, during replacement, and before writing.

-windowwidth width

The window width to use (also supresses use of any VOI LUT).

-windowlevel|windowcenter center

The window center to use (also supresses use of any VOI LUT).

-ignorewindow

Ignore window center and width values in the input file, and use the full pixel value range instead (if no other command line options).

-voilut numberfromzero

Use the selected VOI LUT from the input file (indexed from 0 not 1).

-ignorevoilut

Ignore any VOI LUTs in the input file, and use the window values or the full pixel value range instead (if no other command line options).

-invertedgray

Invert the grayscale, overriding the PhotometricInterpretation in the input file.

-signed|unsigned

Override the sign specified in the PixelRepresentation in the input file.

EXAMPLES

  % dctopgm8 file.dcm file.pgm Read ...        Rows = 2294
       Columns = 1914
       NumberOfFrames = 0
       PhotometricInterpretation = MONOCHROME2
       SamplesPerPixel = 1
       BitsAllocated = 16
       BitsStored = 12
       HighBit = 11
       PixelRepresentation = 0
       PlanarConfiguration = 0
       RescaleIntercept = 0
       RescaleSlope = 1
       WindowCenter = 2905
       WindowWidth = 900
       VOILUTs = 3
       PixelData Value Length = 0x85fe78
Setting window values extracted from object because present not set on command line Using ...        Rows = 2294
       Columns = 1914
       NumberOfFrames = 1
       PhotometricInterpretation = MONOCHROME2
       SamplesPerPixel = 1
       BitsAllocated = 16
       BitsStored = 12
       HighBit = 11
       PixelRepresentation = 0
       PlanarConfiguration = 0
       RescaleIntercept = 0
       RescaleSlope = 1
       WindowCenter =
       WindowWidth =
       VOILUTs = 0 of 3
       Rows*Columns*SamplesPerPixel*BitsAllocated/8 = 0x85fe78
Writing ... Applying VOILUT 0

FILES

 

AUTHOR

Copyright (c) 1993-2015, David A. Clunie DBA PixelMed Publishing. All rights reserved.