transparent hatch

[Richard Greenwood]

Since Mapserver 4.4, when I want to output jpegs, if I want a simple
vector hatch to be transparent (for underlying layer to show thru) I
have to set IMAGEMODE PC256:

OUTPUTFORMAT
  NAME jpeg
  DRIVER "GD/JPEG"
  MIMETYPE "image/jpeg"
  IMAGEMODE PC256
  EXTENSION "jpg"
END

If I use IMAGEMODE RGB, the space between the vector lines is opaque white.

My symbol definition:

Symbol 
	NAME 'Diag_NE_SW'
	TYPE VECTOR
	POINTS
		0 1
		1 0
	END
END 

And my class definition:

CLASS
	NAME "FEMA 500 Year Flood Zone SHX"
	EXPRESSION 'SHX'
	STYLE
		COLOR 112 186 248
		OUTLINECOLOR 0 0 255
		SYMBOL 'Diag_NE_SW'
		SIZE 20
	END
END

Am I overlooking anything? I would prefer to use IMAGEMODE RGB.

Thanks,
Rich

-- 
Richard Greenwood
richard.greenwood at gmail.com
www.greenwoodmap.com