[gdal-dev] Re: Lossless JPEG in GDAL

[Ivan Lucena]

Scott, Jukka, Frank,

The attached file "structure.doc" belongs to the IJG libjpeg source code 
distribution and says:

"The library does not support the lossless (spatial) JPEG process. 
Lossless  JPEG shares little or no code with lossy JPEG, and would 
normally be used  without the extensive pre- and post-processing 
provided by this library.  We feel that lossless JPEG is better handled 
by a separate library."

Best regards,

Ivan

Jukka Rahkonen wrote:
> Scott Arko <sarko <at> asf.alaska.edu> writes:
> 
>>
>> Frank,
>> Thanks for the idea on filing a ticket.  I will do that.  I tried
>> another suggestion to install Jasper and see if I could load my images
>> as lossless JPEG2000 images, however, this does not seem to work.  For
>> the time being I think I will just write a quick converter using
>> libjpeg, but it would be nice to have support for this in GDAL.  I
>> don't imagine many people run into this file format, though.  
>> Best Regards,
>> Scott
> 
> 
> Hi,
> 
> Lossless JPEG2000 images work for me with JP2KAK and JP2MrSID drivers.  JP2ECW
> works partially, only problem being that it makes a lossy output from lossless
> image.  I have never played woth lossless JPEG.
> 
> -Jukka Rahkonen-
> 
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