Hi all, Dark tiles are generated when I run gdal2tiles.py on a .IMG file(a scanned and georeferenced topographical map). A sample png of the tiles generated is found here <https://sites.google.com/site/lumtegis/files/519.png>. Even when i translate to tiff, the output is still the same. Why does gdal2tiles.py give this result ? The gdalinfo output is as below:
Driver: HFA/Erdas Imagine Images (.img) Files: ALOI.IMG ALOI.IMG.aux.xml Size is 3830, 2552 Coordinate System is: GEOGCS["GCS_WGS_1984", DATUM["WGS_1984", SPHEROID["WGS_1984",6378137.0,298.257223563]], PRIMEM["Greenwich",0.0], UNIT["Degree",0.017453292519943295]] Origin = (32.999437318839924,3.000470692247897) Pixel Size = (0.000392066994127,-0.000392066994127) Metadata: DataType=Generic Corner Coordinates: Upper Left ( 32.9994373, 3.0004707) ( 32d59'57.97"E, 3d 0'1.69"N) Lower Left ( 32.9994373, 1.9999157) ( 32d59'57.97"E, 1d59'59.70"N) Upper Right ( 34.5010539, 3.0004707) ( 34d30'3.79"E, 3d 0'1.69"N) Lower Right ( 34.5010539, 1.9999157) ( 34d30'3.79"E, 1d59'59.70"N) Center ( 33.7502456, 2.5001932) ( 33d45'0.88"E, 2d30'0.70"N) Band 1 Block=64x64 Type=UInt16, ColorInterp=Undefined Description = Layer_1 Min=0.000 Max=255.000 Minimum=0.000, Maximum=255.000, Mean=225.572, StdDev=31.338 NoData Value=256 Overviews: 1915x1276, 958x638, 479x319, 240x160 Metadata: STATISTICS_COVARIANCES=982.046346716112,845.521289084631,710.510646703791 STATISTICS_MINIMUM=0 STATISTICS_MAXIMUM=255 STATISTICS_MEAN=225.57242379015 STATISTICS_MEDIAN=0 STATISTICS_MODE=0 STATISTICS_STDDEV=31.337618714831 STATISTICS_SKIPFACTORX=1 STATISTICS_SKIPFACTORY=1 STATISTICS_EXCLUDEDVALUES= LAYER_TYPE=athematic Image Structure Metadata: COMPRESSION=RLE Band 2 Block=64x64 Type=UInt16, ColorInterp=Undefined Description = Layer_2 Min=4.000 Max=255.000 Minimum=4.000, Maximum=255.000, Mean=226.079, StdDev=29.739 NoData Value=256 Overviews: 1915x1276, 958x638, 479x319, 240x160 Metadata: STATISTICS_COVARIANCES=845.521289084631,884.412989496947,765.062067015664 STATISTICS_MINIMUM=4 STATISTICS_MAXIMUM=255 STATISTICS_MEAN=226.07921779459 STATISTICS_MEDIAN=0 STATISTICS_MODE=0 STATISTICS_STDDEV=29.739081853631 STATISTICS_SKIPFACTORX=1 STATISTICS_SKIPFACTORY=1 STATISTICS_EXCLUDEDVALUES= LAYER_TYPE=athematic Image Structure Metadata: COMPRESSION=RLE Band 3 Block=64x64 Type=UInt16, ColorInterp=Undefined Description = Layer_3 Min=0.000 Max=255.000 Minimum=0.000, Maximum=255.000, Mean=172.929, StdDev=27.135 NoData Value=256 Overviews: 1915x1276, 958x638, 479x319, 240x160 Metadata: STATISTICS_COVARIANCES=710.510646703791,765.062067015664,736.335138826829 STATISTICS_MINIMUM=0 STATISTICS_MAXIMUM=255 STATISTICS_MEAN=172.92884721066 STATISTICS_MEDIAN=0 STATISTICS_MODE=0 STATISTICS_STDDEV=27.135495920046 STATISTICS_SKIPFACTORX=1 STATISTICS_SKIPFACTORY=1 STATISTICS_EXCLUDEDVALUES= LAYER_TYPE=athematic Image Structure Metadata: COMPRESSION=RLE Thanks, Allan. -- Allan Oware Cell: +254 727 365820
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