8 bit greyscale images look like 4 bit

[Scott Phillips]

Hello all,

I am setting up a new server with tiles of 8 bit greyscale images
(landsat 7 panchromatic).   Although the images are 255 color, they
are looking like 16 color images on the screen.  I have tried 
converting them to palleted color (with shades of gray), upgrading
to GD1.8.3, and converting the images from TIFF to EPPL, but I get
the same results.

Are the images being cut down in colors in "mapraster.c" or somewhere.
If so, does anyone know of a workaround to let the images show up in
8 bit color.

Thanks,

Scott Phillips
CSUS/ESRP
sphillip at esrp.org