[gdal-dev] Fwd: [OpenJPEG] OpenJPEG 2.2.0 is out ! Faster and safer.

[Even Rouault]

Hi,

> 
> 
> I rebuilt GDAL (older version: 2.1.2) using this new open jpeg 2.2.0
> (https://github.com/uclouvain/openjpeg/releases/download/v2.2.0/openjpeg-v2
> .2.0-linux-x86_64.tar.gz)
> 
> and tried to convert two jp2 dataset to tiff (gdal_translate):
> 
> - bluemarble_4km.jp2: (10800 x 5400 pixels). 37.3 mb file size.
> 
> - usgsLanSat.jp2: (8627 x 7745 pixels). 48 mb file size.

Do you know if they use JPEG2000 tiling ?

> 
> 
> Tests were run on virtual machine with ‘Ubuntu 16.04’ operation system, 18
> gb RAM and 2 CPU processors.
> 

> 
> These results were not expected since the new openJpeg should be faster than
> the previous one. Could this be cause by 'gdal_translate' not using threads
> that the new openjpeg uses for performance boost ?

By default, GDAL will now enable openjpeg thread support. So you need to set the 
OPJ_NUM_THREADS environment variable. That said, you should already get significant 
performance improvements even without enabling multi-threading. I'm not sure why you 
don't get them.

I'd be interested if you could share those images.

Even


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