Hi, I'm not sure about which type of logic is applied by ENVI when saving to ENVI 8-bit. You could try with: gdal_translate -of ENVI -ot Byte -scale gtiffimg.tif fromgdal.raw
and see the result. the "-scale" option will rescale the pixel values from the UINT16 range 1 - 24806 to Byte 0 - 255. In case it is still different, you could also try a "gdalinfo -stats" on fromENVI and you could probably work on the -scale option to get the same result. Let us know. Regards, Daniele On Thu, Jun 30, 2011 at 4:11 PM, Solimyr <giannicrist...@msn.com> wrote: > Driver: GTiff/GeoTIFF > Files: File.tif > File.tfw > Size is 1828, 1646 > Coordinate System is: > PROJCS["WGS 84 / UTM zone 47S", > GEOGCS["WGS 84", > DATUM["WGS_1984", > SPHEROID["WGS 84",6378137,298.257223563, > AUTHORITY["EPSG","7030"]], > AUTHORITY["EPSG","6326"]], > PRIMEM["Greenwich",0], > UNIT["degree",0.0174532925199433], > AUTHORITY["EPSG","4326"]], > PROJECTION["Transverse_Mercator"], > PARAMETER["latitude_of_origin",0], > PARAMETER["central_meridian",99], > PARAMETER["scale_factor",0.9996], > PARAMETER["false_easting",500000], > PARAMETER["false_northing",10000000], > UNIT["metre",1, > AUTHORITY["EPSG","9001"]], > AUTHORITY["EPSG","32747"]] > Origin = (650301.875000000000000,9895384.375000000000000) > Pixel Size = (1.250000000000000,-1.250000000000000) > Metadata: > TIFFTAG_XRESOLUTION=1 > TIFFTAG_YRESOLUTION=1 > AREA_OR_POINT=Area > Image Structure Metadata: > INTERLEAVE=BAND > Corner Coordinates: > Upper Left ( 650301.875, 9895384.375) (100d21' 2.82"E, 0d56'46.41"S) > Lower Left ( 650301.875, 9893326.875) (100d21' 2.84"E, 0d57'53.40"S) > Upper Right ( 652586.875, 9895384.375) (100d22'16.73"E, 0d56'46.38"S) > Lower Right ( 652586.875, 9893326.875) (100d22'16.76"E, 0d57'53.37"S) > Center ( 651444.375, 9894355.625) (100d21'39.79"E, 0d57'19.89"S) > Band 1 Block=1828x1 Type=UInt16, ColorInterp=Gray > Minimum=1.000, Maximum=24806.000, Mean=230.385, StdDev=290.366 > Metadata: > STATISTICS_MINIMUM=1 > STATISTICS_MAXIMUM=24806 > STATISTICS_MEAN=230.38520376963 > STATISTICS_STDDEV=290.36594272901 > > > -- > View this message in context: > http://osgeo-org.1803224.n2.nabble.com/GDAL-TRANSLATE-Gray-scale-tp6533237p6533400.html > Sent from the GDAL - Dev mailing list archive at Nabble.com. > _______________________________________________ > gdal-dev mailing list > gdal-dev@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/gdal-dev > -- ------------------------------------------------------- Ing. Daniele Romagnoli GeoSolutions S.A.S. Software Engineer Via Poggio alle Viti 1187 55054 Massarosa (LU) Italy phone: +39 0584 962313 fax: +39 0584 962313 http://www.geo-solutions.it http://geo-solutions.blogspot.com/ http://www.youtube.com/user/GeoSolutionsIT http://it.linkedin.com/in/danieleromagnoli -------------------------------------------------------
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