[Dcmlib] Signed Images

[Aris Basic]

I have some of my images havnot tested it with gdcm provided images will 
probably do it and compare with vtkgdcmViewer.
IM trying to display them with OpenGL (creating and RECT texture from 
pixel data [ opengl supposedly shoudl be able to
deal with signed pixel data , but doesnt look like its doing )
(i tryed too figgure out how is VTK donig the W/L transfomration and 
rest but did not have luck finding that piece of code quickly :)


Jean-Pierre Roux wrote:

> Aris Basic wrote:
>
>> is gdcm doing any conversion on pixel data from signed 
>> (pixelrepresentation == 1) images ?
>> pixelrepresentation == 0 images i can display nicely but 
>> representation 1 they come up strange :(
>
>
>
> gdcm doesn't make any transformation for 'signed pixels'.
> It's up to the user to deal with the sign.
> How do you display the image?
> Did you try with vtkgdcmViever? (of course, you need VTK ...)
>
> In our test data set ( gdcmData), there are a few 'signed pixels' 
> images :
>
> MR-MONO2-16-head.dcm CT-MONO2-16-chest.dcm
> CT-MONO2-16-ankle.dcm  CT-MONO2-16-ort.dcm
> CT-MONO2-16-brain.dcm
> GE_RHAPSODE-16-MONO2-JPEG-Fragments.dcm 
> GE_GENESIS-16-MONO2-Uncompressed-UnusualVR.dcm
> GE_GENESIS-16-MONO2-WrongLengthItem.dcm 
> PICKER-16-MONO2-No_DicomV3_Preamble.dcm
> 012345.002.050.dcm
>
> Did you try to display them?
> HTH.
>
> Jean-Pierre
>
>>
>> jsut trying to find a bug :) not pointing fingers
>
>
> Thx for reporting it.
> Could you send us one of your images, so we can check 'at home' if 
> there is any problem.
>
>>
>>
>> Aris
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