[Gdal-dev] Re: Newbie doubt: gdalwarp

[WolfgangZ]

om schrieb:
> Hi,
> 
> How can I scale a GeoTIFF image ?
> I have tried
> gdalwarp -tr 8000 8000 -ts 8000 8000 inputimage.tif out.tif        
> (input image resolution is 5213x5613) and got the following error.
> 
> Creating output file that is 0P x 0L.
> ERROR 1: Attempt to create 0x0x1 TIFF file, but width, height and bands
> must be positive.
> 
> -Is it possible to scale the image using gdalwarp? or is there any other 
> way I can accomplish this...
> -or is it because I have done something stupid?
> 
> Thanks in advance
> 
> Om

perhaps gdal_translate?
from http://www.gdal.org/gdal_translate.html
-outsize xsize[%] ysize[%]:
     Set the size of the output file. Outsize is in pixels and lines 
unless '' is attached in which case it is as a fraction of the input 
image size.