[gdal-dev] Problem with image overview creation in GTiff files

[Frank Warmerdam]

Ozy Sjahputera wrote:
> I am trying to create image overviews for a GTiff file using 
> GDALDataset::BuildOverviews. I keep getting various errors such as:
> 
> ERROR 1: TIFFSetField:VISUAL.tif: Cannot modify tag "Compression" while 
> writing
...
> writing
> ERROR 1: TIFFSetField:VISUAL.tif: Cannot modify tag "TileLength" while 
> writing
> ERROR 1: TIFFBuildOverviews:Can not write tiles to a stripped image
> 
> 
> Here is my code:
> 
>    int OverviewList[5] = { 2, 4, 8, 16, 32 };
>    CPLErr overview_err = outDS->BuildOverviews( "AVERAGE_MAGPHASE", 5, 
> OverviewList, 0, NULL, NULL, NULL );
> 
> 
> I have used BuildOverviews before on HFA images and they are fine. Any 
> idea?

Ozy,

I'm surprised.  I wonder if you might have opened your file in read-only
mode?  Can you reproduce the problem with the gdaladdo commandline program?

Best regards,
-- 
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I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
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