[Mapserver-users] Transparent layer

[Sean Gillies]

On Jul 28, 2004, at 2:58 PM, Jean-Denis Giguere wrote:

> 2 old bugs give me some trouble this time.  I'm sure there is a 
> solution but I can't figure how resolve my problem.
>
> I have 29 vector layers in my mapfile. Some of them use pixmap with 
> transparent background.
> If I use IMAGEMODE PC256, I have correct result in general, but 
> sometime, I get the problem describe in bug 397 (Color problems when 
> using raster symbols and 8 bits PNG).
>
> If I use IMAGEMODE RGBA, my transperency is considered as a solid 
> color. Everything under the transparent layer will be erase.
>
> If I use IMAGEMODE RGB, transparency of my pixmap is not considered.
>
> We can consider RGB and RGBA as similar result because both hide what 
> is under the transparent layer. This problem is described by bug 490 ( 
> point symbols - for png symbols, the transparency is ignored).
>
> I would like to know how do you render you transparent layer with 
> Mapserver 4.2 or higher ?
>
> I always use the GD/PNG driver. I'm ready to use other drivers, except 
> */GIF.
>
> Thank you,
>
> Jean-Denis  Giguère
>

Jean-Denis, the same trouble exists with the GD/JPEG driver, and goes 
back
as far as MapServer 4.0.

Sean

--
Sean Gillies
sgillies at frii dot com
http://users.frii.com/sgillies