Hi, I'm working with a 16 bit SPOT 6 image that I want to convert from 16 bit pixel depth to 8 bit pixel depth. I say 16 bit, but if I load the file into Envi, it reports that uses only 12 bits. However gdalinfo reports 16 bit (see below).
I've manage to do so on the multispectral image, but the result is poor colour wise. So I split the image into its four bands that is, I now have one image per band. When I now try to convert to 8 bit, I get a message that says: "Warning 742327101_R1C1_band1_8bit.TIF not created". The command I'm using is: gdal_translate -ot Byte -of GTiff "D:/SPOT 6/EightBit/IMG_SPOT6_MS_201304290812030_ORT_742327101_R1C1_band1.TIF" 742327101_R1C1_band1_8bit.TIF gdalinfo for the original MS image gives the following result: Driver: GTiff/GeoTIFF Files: D:/SPOT 6/SANSA_SouthAfr_246_SO13012989_43_DS_SPOT6_201304290812030_FR1_FR1_SE1_SE1_E021S32_03414/PROD_SPOT6_001/VOL_SPOT6_001_A/IMG_SPOT6_MS_001_A/IMG_SPOT6_MS_201304290812030_ORT_742327101_R1C1.TIF D:/SPOT 6/SANSA_SouthAfr_246_SO13012989_43_DS_SPOT6_201304290812030_FR1_FR1_SE1_SE1_E021S32_03414/PROD_SPOT6_001/VOL_SPOT6_001_A/IMG_SPOT6_MS_001_A/IMG_SPOT6_MS_201304290812030_ORT_742327101_R1C1.tif.ovr D:/SPOT 6/SANSA_SouthAfr_246_SO13012989_43_DS_SPOT6_201304290812030_FR1_FR1_SE1_SE1_E021S32_03414/PROD_SPOT6_001/VOL_SPOT6_001_A/IMG_SPOT6_MS_001_A/IMG_SPOT6_MS_201304290812030_ORT_742327101_R1C1.TFW D:/SPOT 6/SANSA_SouthAfr_246_SO13012989_43_DS_SPOT6_201304290812030_FR1_FR1_SE1_SE1_E021S32_03414/PROD_SPOT6_001/VOL_SPOT6_001_A/IMG_SPOT6_MS_001_A/IMG_SPOT6_MS_201304290812030_ORT_742327101_R1C1.TIF.aux.xml Size is 7680, 7680 Coordinate System is: PROJCS["WGS 84 / UTM zone 34S", 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",21], PARAMETER["scale_factor",0.9996], PARAMETER["false_easting",500000], PARAMETER["false_northing",10000000], UNIT["metre",1, AUTHORITY["EPSG","9001"]], AUTHORITY["EPSG","32734"]] Origin = (426894.000000000000000,6421830.000000000000000) Pixel Size = (6.000000000000000,-6.000000000000000) Metadata: AREA_OR_POINT=Area TIFFTAG_DATETIME=2013:12:05 14:23:06 TIFFTAG_IMAGEDESCRIPTION=B2, B1, B0, B3 TIFFTAG_XRESOLUTION=6 TIFFTAG_YRESOLUTION=6 Image Structure Metadata: INTERLEAVE=BAND Corner Coordinates: Upper Left ( 426894.000, 6421830.000) ( 20d13'23.42"E, 32d20'16.91"S) Lower Left ( 426894.000, 6375750.000) ( 20d13'10.50"E, 32d45'13.25"S) Upper Right ( 472974.000, 6421830.000) ( 20d42'46.12"E, 32d20'24.35"S) Lower Right ( 472974.000, 6375750.000) ( 20d42'41.34"E, 32d45'20.81"S) Center ( 449934.000, 6398790.000) ( 20d28' 0.35"E, 32d32'49.70"S) Band 1 Block=7680x128 Type=UInt16, ColorInterp=Red Min=0.000 Max=2768.000 Minimum=0.000, Maximum=2768.000, Mean=254.357, StdDev=82.827 Overviews: 3840x3840, 1920x1920, 960x960, 480x480, 240x240 Metadata: STATISTICS_COVARIANCES=6860.33555334015,5408.39177012214,3932.59000707709,8359.55872888383 STATISTICS_MAXIMUM=2768 STATISTICS_MEAN=254.35743888007 STATISTICS_MINIMUM=0 STATISTICS_SKIPFACTORX=1 STATISTICS_SKIPFACTORY=1 STATISTICS_STDDEV=82.827142612432 Band 2 Block=7680x128 Type=UInt16, ColorInterp=Green Min=0.000 Max=1928.000 Minimum=0.000, Maximum=1928.000, Mean=272.449, StdDev=67.362 Overviews: 3840x3840, 1920x1920, 960x960, 480x480, 240x240 Metadata: STATISTICS_COVARIANCES=5408.39177012214,4537.57701249689,3512.4873688442,6910.89114933438 STATISTICS_MAXIMUM=1928 STATISTICS_MEAN=272.44932240804 STATISTICS_MINIMUM=0 STATISTICS_SKIPFACTORX=1 STATISTICS_SKIPFACTORY=1 STATISTICS_STDDEV=67.361539564479 Band 3 Block=7680x128 Type=UInt16, ColorInterp=Blue Min=0.000 Max=2264.000 Minimum=0.000, Maximum=2264.000, Mean=291.925, StdDev=54.875 Overviews: 3840x3840, 1920x1920, 960x960, 480x480, 240x240 Metadata: STATISTICS_COVARIANCES=3932.59000707709,3512.4873688442,3011.23474438976,5111.02811591707 STATISTICS_MAXIMUM=2264 STATISTICS_MEAN=291.92457129584 STATISTICS_MINIMUM=0 STATISTICS_SKIPFACTORX=1 STATISTICS_SKIPFACTORY=1 STATISTICS_STDDEV=54.874718626976 Band 4 Block=7680x128 Type=UInt16, ColorInterp=Undefined Min=0.000 Max=2699.000 Minimum=0.000, Maximum=2699.000, Mean=374.146, StdDev=115.219 Overviews: 3840x3840, 1920x1920, 960x960, 480x480, 240x240 Metadata: STATISTICS_COVARIANCES=8359.55872888383,6910.89114933438,5111.02811591707,13275.4755734648 STATISTICS_MAXIMUM=2699 STATISTICS_MEAN=374.14637317234 STATISTICS_MINIMUM=0 STATISTICS_SKIPFACTORX=1 STATISTICS_SKIPFACTORY=1 STATISTICS_STDDEV=115.21925001259 gdalinfo for band 1 of the image that I'm trying to use for the conversion, gives the following results: Driver: GTiff/GeoTIFF Files: D:/SPOT 6/SANSA_SouthAfr_246_SO13012989_43_DS_SPOT6_201304290812030_FR1_FR1_SE1_SE1_E021S32_03414/PROD_SPOT6_001/VOL_SPOT6_001_A/IMG_SPOT6_MS_001_A/IMG_SPOT6_MS_201304290812030_ORT_742327101_R1C1.TIF D:/SPOT 6/SANSA_SouthAfr_246_SO13012989_43_DS_SPOT6_201304290812030_FR1_FR1_SE1_SE1_E021S32_03414/PROD_SPOT6_001/VOL_SPOT6_001_A/IMG_SPOT6_MS_001_A/IMG_SPOT6_MS_201304290812030_ORT_742327101_R1C1.tif.ovr D:/SPOT 6/SANSA_SouthAfr_246_SO13012989_43_DS_SPOT6_201304290812030_FR1_FR1_SE1_SE1_E021S32_03414/PROD_SPOT6_001/VOL_SPOT6_001_A/IMG_SPOT6_MS_001_A/IMG_SPOT6_MS_201304290812030_ORT_742327101_R1C1.TFW D:/SPOT 6/SANSA_SouthAfr_246_SO13012989_43_DS_SPOT6_201304290812030_FR1_FR1_SE1_SE1_E021S32_03414/PROD_SPOT6_001/VOL_SPOT6_001_A/IMG_SPOT6_MS_001_A/IMG_SPOT6_MS_201304290812030_ORT_742327101_R1C1.TIF.aux.xml Size is 7680, 7680 Coordinate System is: PROJCS["WGS 84 / UTM zone 34S", 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",21], PARAMETER["scale_factor",0.9996], PARAMETER["false_easting",500000], PARAMETER["false_northing",10000000], UNIT["metre",1, AUTHORITY["EPSG","9001"]], AUTHORITY["EPSG","32734"]] Origin = (426894.000000000000000,6421830.000000000000000) Pixel Size = (6.000000000000000,-6.000000000000000) Metadata: AREA_OR_POINT=Area TIFFTAG_DATETIME=2013:12:05 14:23:06 TIFFTAG_IMAGEDESCRIPTION=B2, B1, B0, B3 TIFFTAG_XRESOLUTION=6 TIFFTAG_YRESOLUTION=6 Image Structure Metadata: INTERLEAVE=BAND Corner Coordinates: Upper Left ( 426894.000, 6421830.000) ( 20d13'23.42"E, 32d20'16.91"S) Lower Left ( 426894.000, 6375750.000) ( 20d13'10.50"E, 32d45'13.25"S) Upper Right ( 472974.000, 6421830.000) ( 20d42'46.12"E, 32d20'24.35"S) Lower Right ( 472974.000, 6375750.000) ( 20d42'41.34"E, 32d45'20.81"S) Center ( 449934.000, 6398790.000) ( 20d28' 0.35"E, 32d32'49.70"S) Band 1 Block=7680x128 Type=UInt16, ColorInterp=Red Min=0.000 Max=2768.000 Minimum=0.000, Maximum=2768.000, Mean=254.357, StdDev=82.827 Overviews: 3840x3840, 1920x1920, 960x960, 480x480, 240x240 Metadata: STATISTICS_COVARIANCES=6860.33555334015,5408.39177012214,3932.59000707709,8359.55872888383 STATISTICS_MAXIMUM=2768 STATISTICS_MEAN=254.35743888007 STATISTICS_MINIMUM=0 STATISTICS_SKIPFACTORX=1 STATISTICS_SKIPFACTORY=1 STATISTICS_STDDEV=82.827142612432 Band 2 Block=7680x128 Type=UInt16, ColorInterp=Green Min=0.000 Max=1928.000 Minimum=0.000, Maximum=1928.000, Mean=272.449, StdDev=67.362 Overviews: 3840x3840, 1920x1920, 960x960, 480x480, 240x240 Metadata: STATISTICS_COVARIANCES=5408.39177012214,4537.57701249689,3512.4873688442,6910.89114933438 STATISTICS_MAXIMUM=1928 STATISTICS_MEAN=272.44932240804 STATISTICS_MINIMUM=0 STATISTICS_SKIPFACTORX=1 STATISTICS_SKIPFACTORY=1 STATISTICS_STDDEV=67.361539564479 Band 3 Block=7680x128 Type=UInt16, ColorInterp=Blue Min=0.000 Max=2264.000 Minimum=0.000, Maximum=2264.000, Mean=291.925, StdDev=54.875 Overviews: 3840x3840, 1920x1920, 960x960, 480x480, 240x240 Metadata: STATISTICS_COVARIANCES=3932.59000707709,3512.4873688442,3011.23474438976,5111.02811591707 STATISTICS_MAXIMUM=2264 STATISTICS_MEAN=291.92457129584 STATISTICS_MINIMUM=0 STATISTICS_SKIPFACTORX=1 STATISTICS_SKIPFACTORY=1 STATISTICS_STDDEV=54.874718626976 Band 4 Block=7680x128 Type=UInt16, ColorInterp=Undefined Min=0.000 Max=2699.000 Minimum=0.000, Maximum=2699.000, Mean=374.146, StdDev=115.219 Overviews: 3840x3840, 1920x1920, 960x960, 480x480, 240x240 Metadata: STATISTICS_COVARIANCES=8359.55872888383,6910.89114933438,5111.02811591707,13275.4755734648 STATISTICS_MAXIMUM=2699 STATISTICS_MEAN=374.14637317234 STATISTICS_MINIMUM=0 STATISTICS_SKIPFACTORX=1 STATISTICS_SKIPFACTORY=1 STATISTICS_STDDEV=115.21925001259 I'm using QGIS 2.2.0 on Windows 8 as a front end to GDAL. Can anyone perhaps see why the error is occurring or suggest an alternative workflow? Thanks Hanlie _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev