Is it possible with mapserver to change the color of the symbol according to the value read in from postgis ?

Yes this is possible, using the method described by David. I have tested this locally: I have a column in PostGIS named 'color' with various RGB values, and I can display them in MapServer such as the following:

  STYLE
    COLOR [color]
  END

(tested with MapServer version 5.4.0-rc1)


-jeff


--
Jeff McKenna
FOSS4G Consulting and Training Services
http://www.gatewaygeomatics.com/




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