Le jeudi 21 août 2014 08:57:32, Hanlie Pretorius a écrit : > 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".
Are you quoting the exact message ? I can't find any trace of it in the relevant parts of the source code. Did you check that you have write permissions in the directory where you launch the command ? Anyway for what you want to do you likely need to explore the -scale option of gdal_translate. But that's unrelated to the error > > 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_SE > 1_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_SE > 1_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_SE > 1_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_SE > 1_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=5408.39177012214,4537.57701249689,3512.4873688442,6 > 910.89114933438 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=3932.59000707709,3512.4873688442,3011.23474438976,5 > 111.02811591707 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_SE > 1_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_SE > 1_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_SE > 1_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_SE > 1_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=5408.39177012214,4537.57701249689,3512.4873688442,6 > 910.89114933438 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=3932.59000707709,3512.4873688442,3011.23474438976,5 > 111.02811591707 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 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