[Dcmlib] Jpeg Losless

[Mathieu Malaterre]

Aris,

	No problem, it was just a misunderstanding...and some hot french blood :)

	Anyway this was also a problem for me until Jean Pierre Roux explained 
me that lossless jpeg and JPEG-LS are completely two different thing:

http://www.creatis.insa-lyon.fr/pipermail/dcmlib/2005-January/001207.html

and
http://datacompression.info/JPEGLS.shtml
[JPEG-LS is the basis for new lossless/near-lossless compression
standard for continuous-tone images intended for JPEG2000. The standard
is based on the LOCO-I algorithm (LOw COmplexity LOssless COmpression
for Images) developed at Hewlett-Packard Laboratories]


So yes gdcm has no JPEG-LS so far...propositions welcome. As a side note 
I don't think you need the JPEG-LS for your application chance is that 
the DICOM you are trying to read is some good ol' jpeg lossless

HTH
Mathieu
Ps: This is usually easier if you answer the mailing list instead of 
personal email, thanks.


Aris Basic wrote:
> Im sorry you misunderstood me i say the gdcmJpegLS is saying this
> bool gdcm_read_JPEGLS_file (std::ifstream *fp, void *image_buffer)
> {
>   (void)fp;
>   (void)image_buffer;
>   gdcmWarningMacro( "Sorry JPEG-LS File not yet taken into account" );
>   return false;
> }
> 
> and ig gdcmjpeg i read that LS patch was applyed (i never said it was 
> not :) )
> so im wondering is support maybe transparent ? no need for special LS 
> stub or
> LS is not supported (as per stub)
> 
> Mathieu Malaterre wrote:
> 
>> Aris Basic wrote:
>>
>>> Hi is the jpeg losless supported ? according to the code stub in CVS 
>>> its seams like tis not even though gdcmjpeg info talk about applyed 
>>> jpeg ls patch
>>
>>
>>
>> Aris,
>>
>>     Could you please demonstrate how you reach the conclusion that the 
>> lossless patch was not applied to the official ijg library ? I'd love 
>> to hear it.
>>
>> Thanks,
>> Mathieu
> 
> 
> 
>