[gdal-dev] Very large time difference using gdal_translate from Jpeg2000 to different formats using JP2KAK driver

[ahbrown]

Hi,

I am wondering why there is such a large difference in the time to convert a
large O(250MB) Jpeg2000 image to GeoTiff format in comparison with
conversion to other formats (e.g. jpeg, png)?

I am using the Kakadu Jpeg2000 driver. With a 43221 x 36021 Jpeg2000 image.

Results of timed conversions are as follows:



Using RasterIO directly (via the Java wrapper) the conversion takes around 6
seconds.

Any insights are appreciated.

Thanks,


Adam

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