[gdal-dev] Compression artifacts

[Jan Hartmann]

On 12/27/2012 02:41 PM, Even Rouault wrote:
> I've just pushed a fix since building overviews with "--config
> COMPRESS_OVERVIEW JPEG -- config PHOTOMETRIC_OVERVIEW
> YCBCR" when there's a .msk didn't work.
>
>
>> OK Even, thanks. This means that I should use gdal-svn?
> Not necessarily. I think you can workaround the issue by manually building the
> overview on the .msk file as a post-processing step :
>
> gdaladdo -ro --config COMPRESS_OVERVIEW DEFLATE small.tif.msk 2 4 8 16 32 64
Do you mean I should use DEFLATE instead of JPEG as compression for 
overviews for the time being? What is the difference in compression ratio?
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/gdal-dev/attachments/20121227/84fe7d95/attachment-0001.html>