[Mapserver-users] Transparency values - confusion

[Dylan Keon]

 > --- Dylan Keon <keon at nacse.org> wrote:
 >> I've noticed the same thing in 3.7.  When I switch
 >> between 8-bit and
 >> 24-bit output I have to invert my transparency
 >> values (i.e., change 25
 >> to 75 and vice-versa) to get the same effect.
 >
randy james wrote:
> I have been testing outputformat and switching between
> PNG and PNG24 and never had to change anything. Have
> you been using outputformat?

Yep, I'm using OUTPUTFORMAT for both.  I can toggle between the 
imagetypes and see the transparency change on a polygon layer when I 
refresh the map.

#IMAGETYPE png8
IMAGETYPE png24

OUTPUTFORMAT
   NAME png8
   DRIVER "GD/PNG"
   MIMETYPE "image/png"
   IMAGEMODE PC256
   FORMATOPTION "INTERLACE=ON"
END
OUTPUTFORMAT
   NAME png24
   DRIVER "GD/PNG"
   MIMETYPE "image/png"
   IMAGEMODE RGB
   FORMATOPTION "INTERLACE=ON"
END

LAYER
   NAME boundary
   STATUS ON
   TYPE POLYGON
   DATA sevbnd83
   TRANSPARENCY 35
   CLASS
     NAME "Boundary"
     OUTLINECOLOR 110 110 110
     COLOR 243 248 245
   END
END