[gdal-dev] Re: strange behaviour with gdalwarp and LZW compression

[Stefano Iacovella]

Sorry

I forgot to say I'm using GDAL 1.9.0 compiled on ubuntu 10.04

2012/3/7 Stefano Iacovella <stefano.iacovella at gmail.com>:
> Hello all
>
> I'm using gdal utilities to georeference some tiff files.
>
> I'm inserting the gcp using:
>
>  gdal_translate -gcp ....  original.tif original_gcp.tif
>
> Then I use gdalwarp to gereference the images:
>
>  gdalwarp -t_srs EPSG:32633 original_gcp.tif original_warp.tif
>
> The resulting Geotiff is correctly georeferenced and the size is
> approximately the same of the original
>
> The problem arise if I insert the options -co COMPRESS=LZW at the
> warping. The process end successfully but the resulting geotiff is 6
> times the size of the original one!
>
> I've tried to use:
>
> gdal_translate -of GTIFF -co COMPRESS=LZW original_warp.tif
> original_warp_lzw.tif
>
> and it produces a geotiff smaller than the original.
>
> Am I doing something incorrect?
>
> thank you in advance
>
> Stefano
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