[mapserver-users] Re: quick question from mapserver beginner!

[mattmendick]

You first have to make sure you are outputting the image as a png or some
other image format that supports transparency. Like this, at the base of the
mapfile:

        OUTPUTFORMAT
                        NAME mypng
                        DRIVER "GD/PNG"
                        IMAGEMODE RGB
                        FORMATOPTION "INTERLACE=false"
                        MIMETYPE "image/png"
                        EXTENSION "png"
        END
        IMAGETYPE mypng

Then, if your source image is not perfectly square, and has black in areas
that you want to be transparent, you can use the "OFFSITE [R] [G] [B]"
attribute. This tells mapserver that any color in the raster that matches
the color in your OFFSITE parameter should be rendered transparent.

ex:

LAYER
       NAME "blah"
       DATA '/path/to/raster.tiff'
       OFFSITE 0 0 0
END

This has worked for me in the past, I hope it works for you.

-Matt Mendick
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