displaying rasters with negative pixel values

[Chris Garrard]

Hi all,

I have a raster data set that has values from -7 to 10 (mean minimum
temps C).  I can't get any of the pixels with values less than -1 to
display in mapserver.  I have tried using the processing directive to
scale the values and I've tried specifying classes, and neither works.
I have also tried different file formats (geotiffs and erdas .img).

Anyone know why this isn't working?

I'm using mapserver 4.8.3 and gdal 1.3.1 on solaris 10.

Thanks for any ideas,
Chris