<div dir="ltr">After digging around and comparing other images, I realised that the .IMG lacks color interpretation since the ColorInterp parameter in gdalinfo output is undefined<div>for the 3 bands. </div><div>When I attempt to gdal_translate to Gtiff with -expand rgb option, the error output was: band 1 has no color table.</div>
<div>Any hint on how to properly define color interpretation for a .IMG ? I have qgis, grass and gdal in an ubuntu setup.</div><div><br></div><div>Thanks, </div><div>Allan.</div><div><br></div></div><div class="gmail_extra">
<br><br><div class="gmail_quote">On Mon, Jul 14, 2014 at 10:02 AM, Allan Oware <span dir="ltr"><<a href="mailto:allanoware@gmail.com" target="_blank">allanoware@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr"><br clear="all"><div><div class=""><div style="font-family:arial,sans-serif;font-size:13px"><span style="color:rgb(51,51,51);font-family:'Helvetica Neue',Helvetica,Arial,sans-serif;font-size:14px;line-height:18px;background-color:rgba(248,248,248,0.6)">Hi all,</span></div>
<span style="color:rgb(51,51,51);font-family:'Helvetica Neue',Helvetica,Arial,sans-serif;font-size:14px;line-height:18px;background-color:rgba(248,248,248,0.6)">Dark tiles are generated when I run gdal2tiles.py on a .IMG file(a scanned and georeferenced topographical map). </span></div>
<div style="font-family:arial,sans-serif;font-size:13px">
<font color="#333333" face="Helvetica Neue, Helvetica, Arial, sans-serif"><span style="font-size:14px;line-height:18px">A sample png of the tiles generated is found <a href="https://sites.google.com/site/lumtegis/files/519.png" target="_blank">here</a>. Even when i translate to tiff, the output is still the same. Why does </span></font></div>
<div><div class="h5">
<div style="font-family:arial,sans-serif;font-size:13px"><font color="#333333" face="Helvetica Neue, Helvetica, Arial, sans-serif"><span style="font-size:14px;line-height:18px">gdal2tiles.py give this result ? </span></font></div>
<div style="font-family:arial,sans-serif;font-size:13px"><font color="#333333" face="Helvetica Neue, Helvetica, Arial, sans-serif"><span style="font-size:14px;line-height:18px">The gdalinfo output is as below:</span></font></div>
<div style="font-family:arial,sans-serif;font-size:13px"><pre style="white-space:pre-wrap;margin-top:0px;margin-bottom:10px;padding:5px;border:0px;font-size:12px;vertical-align:baseline;overflow:auto;width:auto;max-height:600px;font-family:Consolas,Menlo,Monaco,'Lucida Console','Liberation Mono','DejaVu Sans Mono','Bitstream Vera Sans Mono','Courier New',monospace,serif;word-wrap:normal;color:rgb(51,51,51);line-height:18px;background-color:rgb(238,238,238)">
<code style="margin:0px;padding:0px;border:0px;vertical-align:baseline;font-family:Consolas,Menlo,Monaco,'Lucida Console','Liberation Mono','DejaVu Sans Mono','Bitstream Vera Sans Mono','Courier New',monospace,serif;color:rgb(34,34,34);white-space:inherit">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</code></pre><div><font color="#333333" face="Helvetica Neue, Helvetica, Arial, sans-serif"><span style="font-size:14px;line-height:18px"><br></span></font></div><div><font color="#333333" face="Helvetica Neue, Helvetica, Arial, sans-serif"><span style="font-size:14px;line-height:18px">Thanks,</span></font></div>
<div><font color="#333333" face="Helvetica Neue, Helvetica, Arial, sans-serif"><span style="font-size:14px;line-height:18px">Allan.</span></font></div></div></div></div></div><div><div class="h5">-- <br><div dir="ltr">Allan Oware <div>
Cell: +254 727 365820<br>
</div></div>
</div></div></div>
</blockquote></div><br><br clear="all"><div><br></div>-- <br><div dir="ltr">Allan Oware <div>Cell: +254 727 365820<br></div></div>
</div>