[Mapserver-users] Transparency values - confusion

[Matt Doggett]

Perhaps we can blame ESRI!  Their ArcIMS mapserver uses the same
backwards definition...transparency=1.0 (opaque), transparency=0
(transparent).
Since theirs is a commercial product costing thousands of dollars they
can't possibly be wrong....right!? :)
md

Matt Doggett
Spatial Climate Analysis Service
Oregon State University
316 Strand Ag Hall
Corvallis, OR 97331
(541)737-9153
mdoggett at coas.oregonstate.edu
 

> -----Original Message-----
> From: mapserver-users-admin at lists.gis.umn.edu [mailto:mapserver-users-
> admin at lists.gis.umn.edu] On Behalf Of Frank Warmerdam
> Sent: Friday, March 14, 2003 7:51 AM
> To: havard.tveite at ikf.nlh.no; mapserver-users at lists.gis.umn.edu
> Subject: Re: [Mapserver-users] Transparency values - confusion
> 
> Havard Tveite wrote:
> > Frank Warmerdam wrote:
> >  > Dylan Keon 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.
> >  >
> >  > I will dig into this.  I am pretty sure it is my fault.
> >
> > I think that the PNG24 way of doing things should be the
> > preferred, so I hope that "PNG" (8 bit) behaviour and the
> > documentation can be changed!
> 
> Hi,
> 
> Well, the semantics are really up to Steve Lime.  Steve, could you
> clarify that TRANSPARENT is supposed to work like the mapfile
reference
> says, with TRANSPARENT=100 meaning opaque and TRANSPARENT=0 meaning
> completely transparent?  Any interest in reversing that?
> 
> Best regards,
> 
> --
>
---------------------------------------+--------------------------------
--
> ----
> I set the clouds in motion - turn up   | Frank Warmerdam,
> warmerdam at pobox.com
> light and sound - activate the windows | http://pobox.com/~warmerdam
> and watch the world go round - Rush    | Geospatial Programmer for
Rent
> 
> 
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