Re: [Gdcm2] convert dicom to jpg/png

[Mathieu M. <mat...@gm...>]

On Wed, Mar 11, 2015 at 4:35 PM, Mohica Jasha <moh...@gm...> wrote:
[...]
> However it doesn't work on that CT1_JLSL.dcm
>
> I wonder if there is any way to make it work against CT1_JLSL.dcm. How
> can I convert signed representation to unsigned if this is what makes
> it failed

Yes, see below:

> [root@localhost ~]# gdcminfo CT1_JLSL_raw.dcm
[...]
> PixelRepresentation:1
[...]
> Thank you very much in advance

So indeed the dataset is signed, and thus it is illegal to store the
data stream as PGM.

Since your request is very far from being descriptive, you can always
do something as dumb as:

  gdcmraw CT1_JLSL.dcm tmp.jls
  gdcmimg tmp.jls tmp.jls.dcm
  gdcmconv --raw tmp.jls.dcm tmp.raw.dcm
  gdcmimg tmp.raw.dcm tmp.raw.pgm

-> There you go, you have a valid 16bits PGM file which represent your
initial image. You can even do a round-trip to check GDCM is not
corrupting the Pixel Data:

  gdcmimg --sign 1 tmp.raw.pgm tmp.raw.pgm.dcm
  gdcmviewer tmp.raw.pgm.dcm

(or use any other valid DICOM viewer to check), or simply:  `gdcminfo
--md5sum tmp.raw.pgm.dcm` if you are keen on command line tools.

HTH