[gdal-dev] Compression artifacts

[Dmitry Baryshnikov]

Hi Jan,

You can cut result raster with the geometry (shape file) using gdalwarp 
with cutline option (http://gdal.org/gdalwarp.html).

Best regards,
     Dmitry

27.12.2012 16:38, Jan Hartmann ?????:
> Can anyone tell me wath is happening here? I have a large three-band 
> raster (3.8G) looking like this:
>
> http://mapserver.sara.nl/map2a.png
>
> I compress it (from information from this list a few days ago) with:
>
> gdal_translate -co COMPRESS=JPEG -co PHOTOMETRIC=YCBCR big.tif small.tif
> gdaladdo --config COMPRESS_OVERVIEW JPEG --config PHOTOMETRIC_OVERVIEW 
> YCBCR -ro -r gauss small.tif 2 4 8 16 32 64
>
> and get a file of 37M, which is nice. However, the map has all kinds 
> of rubbish at the borders. It looks like this:
>
> http://mapserver.sara.nl/map2b.png
>
> The equivalent pictures of a small part of the map look like this:
>
> http://mapserver.sara.nl/map1a.png
> http://mapserver.sara.nl/map1b.png
>
> Can anyone help me?
>
> Jan
>
>
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