[gdal-dev] Gdalenhance, VRT and LUT

[Rahkonen Jukka]

Hi Even,

Than you for confirming the observetion.

It seems that the gdalenhance output from 16 bit into 8 bit GeoTIFF copies the statistics even they obviously should be recomputed, but I need to make some more tests. This output made me think so:

Band 1 Block=12000x1 Type=Byte, ColorInterp=Gray
  Min=1.000 Max=1145.000
  Minimum=1.000, Maximum=1145.000, Mean=24.459, StdDev=21.984
  NoData Value=0
  Metadata:
    STATISTICS_MAXIMUM=1145
    STATISTICS_MEAN=24.459199743056
    STATISTICS_MINIMUM=1
    STATISTICS_STDDEV=21.984243009486
    STATISTICS_VALID_PERCENT=100

-Jukka-


________________________________________
Lähettäjä: Even Rouault <even.rouault at spatialys.com>
Lähetetty: Sunnuntai 26. lokakuuta 2025 23.34
Vastaanottaja: Rahkonen Jukka <jukka.rahkonen at maanmittauslaitos.fi>; 'gdal-dev at lists.osgeo.org' <gdal-dev at lists.osgeo.org>
Aihe: Re: [gdal-dev] Gdalenhance, VRT and LUT

Hi Jukka,Le 26/10/2025 à 22:23, Rahkonen Jukka via gdal-dev a écrit :Hi,

I tried to use gdalenhance by having VRT as the outputformat and supposed that the resulting VRT would contain LUT elements, but it did not. Is this a known but undocumented limitation in https://gdal.org/en/stable/programs/gdalenhance.html?yes. It does use VRT internally, but using a method (VRTSourcedRasterBand::AddFuncSource()) that doesn't support serialization as XML VRT.Error message and doc added in https://github.com/OSGeo/gdal/commit/d7748d51e550b75b19869a1e222bdf85b40c75bfEven-- http://www.spatialys.com
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