[Dcmlib] Jpeg Losless

[Aris Basic]

thx
that clears it up :)

ps (it was a wrong button :)

Mathieu Malaterre wrote:

> 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
>>
>>
>>
>>
>>
>