[gdal-dev] Creating external overviews for JP2 files?

[Andrea Aime]

Hi,
I have a JP2 file that has an unsatisfactory amount of quality levels and
was trying to create external overviews in tiff format for it (to have
faster views when fairly zoomed out, in a mosaic with many files).
I was trying with the following, but it fails:

gdaladdo -ro --config COMPRESS_OVERVIEW JPEG --config PHOTOMETRIC_OVERVIEW
YCBCR --config INTERLEAVE_OVERVIEW PIXEL  myfile.jp2 2 4 8 16 32
myfile.jp2: BuildOverviews() not supported for this dataset.
Overview building failed.

I guess I can go using gdal_translate with the outsize parameter and then
use gdaladdo on it but was
wondering why external overview creation is not supported for JP2 (like,
maybe there are good reasons for it...
I looked at the code and have the impression that the code is reading the
most appropriate quality level
without any further optimization, besides maybe in memory subsampling, but
hey, I get lost easily in C/C++
code).

Cheers
Andrea

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