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white background and NWS/NOAA logo

I have for some time run scripts that produce maps with white backgrounds. I have a copy of the coltbl.xmp file in my working directory with white as the first entry to achieve this. However, when I do this, when I use gptext to put on the NWS and NOAA logos, the white in the logos is switched to black.
Any ideas on how to resolve this? On the script I am working on right now, I run gpmap, gdplot2, and then gptext (to add the titles and logos).
In addition, the logos never look very clean. Would this be because of the size? I use size 2 and they look a little blurry. Any ideas on how to clean them up? 

Example of what I am referring to at:
http://www.prh.noaa.gov/cphc/tc_graphics/EP072004_PROB34_F120_06.gif

Thanks!!

Maureen
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