pmapper-users

[pmapper-users] PNG transparency with raster

[Tétranéon <tet...@fr...>]

Hi everyone,

First, thanks for this fantastic GIS...

I use png files with transparency on my map. But the PNG lost their
transparency when a raster is active.

I only in the change this driver in the pmapper_demo.map file but the
problem is the same with GD/PNG :

OUTPUTFORMAT
    NAME "png"
    DRIVER "AGG/PNG"
    MIMETYPE "png"
    IMAGEMODE RGB
    FORMATOPTION  INTERLACE=OFF
    TRANSPARENT OFF
    EXTENSION "png"
END

Any ideas ?

Re: [pmapper-users] PNG transparency with raster

[Armin B. <arm...@gm...>]

On 01/03/2010 23:07, Tétranéon wrote:
> Hi everyone,
>
> First, thanks for this fantastic GIS...
>
> I use png files with transparency on my map. But the PNG lost their
> transparency when a raster is active.
>

I do not really understand what you mean with that. You mean you're 
using as OUTPUTFOMAT a transparent PNG? How did they lose their 
transparency? And it is still a PNG file? All of that with you own data 
& mapfile or with the demo data and the default configuration for that?

The default config file uses <altImgFormatLayers> to define layers that 
swap the outputformat to jpeg if one of those is visible. If that's 
what's causing your problems just remove this setting.

> I only in the change this driver in the pmapper_demo.map file but the
> problem is the same with GD/PNG :
>
> OUTPUTFORMAT
>      NAME "png"
>      DRIVER "AGG/PNG"
>      MIMETYPE "png"
>      IMAGEMODE RGB
>      FORMATOPTION  INTERLACE=OFF
>      TRANSPARENT OFF
>      EXTENSION "png"
> END

Here you define "TRANSPARENT OFF", how could it be transparent then?

armin