While using postgis with mapserver ... i am getting black image in place of raster image... please help
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[Sat Jun 09 01:49:25 2012].727000 CGI Request 1 on process 2096
[Sat Jun 09 01:49:25 2012].729000 msDrawMap(): rendering using outputformat named png (AGG/PNG).
[Sat Jun 09 01:49:25 2012].729000 msDrawMap(): WMS/WFS set-up and query, 0.000s
[Sat Jun 09 01:49:25 2012].731000 msDrawRasterLayerLow(coolwktraster): entering.
[Sat Jun 09 01:49:26 2012].252000 LoadGDALImage(coolwktraster): NODATA value 0 in GDAL
file or PROCESSING directive largely ignored. Not yet fully supported for
unclassified scaled data. The NODATA value is excluded from auto-scaling
min/max computation, but will not be transparent.
[Sat Jun 09 01:49:26 2012].259000 LoadGDALImage(coolwktraster): NODATA value 0 in GDAL
file or PROCESSING directive largely ignored. Not yet fully supported for
unclassified scaled data. The NODATA value is excluded from auto-scaling
min/max computation, but will not be transparent.
[Sat Jun 09 01:49:26 2012].265000 LoadGDALImage(coolwktraster): NODATA value 0 in GDAL
file or PROCESSING directive largely ignored. Not yet fully supported for
unclassified scaled data. The NODATA value is excluded from auto-scaling
min/max computation, but will not be transparent.
[Sat Jun 09 01:49:26 2012].269000 msDrawMap(): Layer 0 (coolwktraster), 0.540s
[Sat Jun 09 01:49:26 2012].269000 msDrawMap(): Drawing Label Cache, 0.000s
[Sat Jun 09 01:49:26 2012].269000 msDrawMap() total time: 0.542s
[Sat Jun 09 01:49:26 2012].424000 msSaveImage(stdout) total time: 0.155s
[Sat Jun 09 01:49:26 2012].425000 mapserv request processing time (loadmap not incl.): 0.698s
[Sat Jun 09 01:49:26 2012].425000 msFreeMap(): freeing map at 025D1FE8.