MAP
  NAME TEST
  EXTENT 490000 4981800 491200 4983000
  SIZE 320 250
  STATUS ON
  IMAGECOLOR 255 255 255
  SHAPEPATH "../data"

  # the DOQ image
  LAYER
   DATA o4409308nw.jpg 
   STATUS DEFAULT
   TYPE RASTER
  END

  LAYER
    NAME test1
    STATUS OFF
    DATA drgncimq3634.tif
    TYPE RASTER    
  END

  LAYER
    NAME test2 # show just the forest
    STATUS OFF
    DATA drgncimq3634.tif
    TYPE RASTER
    CLASS
      EXPRESSION /27|24/
    END
  END

   LAYER
    NAME test3 # just the forest, now turned yellow
    STATUS OFF
    DATA drgncimq3634.tif
    TYPE RASTER    
    TRANSFORM OFF
    CLASS
      EXPRESSION /27|24/
      COLOR 255 255 0
    END
  END

  LAYER
    NAME test4 # everything but the forest, normal colors
    STATUS OFF
    DATA drgncimq3634.tif
    TYPE RASTER        
    CLASS
      EXPRESSION /27|24/
      COLOR -255 -255 -255 # matching pixels are transparent
    END
    CLASS
      EXPRESSION /./ # everything else normal
    END
  END

  LAYER
    NAME test5 # black as is, everything else grey
    STATUS OFF
    DATA drgncimq3634.tif
    TYPE RASTER    
    CLASS
      EXPRESSION /^0$|^1$/
      COLOR 255 255 255	
    END
  END

END