[ka-Map-users] grey background in layer

[Lorenzo Becchi]

> Hi,
>
> I am trying to put shapefiles of Type polygon as layer on top of a 
> rgb-image. Having grouped each single shapefile I now have checkboxes 
> for each layer (first question: is there a possibility to get 
> checkboxes without grouping using ka-map?).
> Well, so far it's fine. However, the environment (outside) of the 
> polygon is colored in gray so covering (darkening) the rgb image even 
> though there should not be any region marked. As a consequence I 
> lowered the opacity value leading to reduced gray-covering but also to 
> a less visible polygonal area. So how is it possible to have only the 
> polygonal area colored and the rest absolutely invisible?
> In this context it is also interesting that this gray background only 
> occurs when "GROUP" is used. Without this only the polygonal area is 
> displayed. But then there are no checkboxes...
>

Hi Thora,
have you tried forcing your group image format to PNG?

LAYER
    ...
    METADATA
        imageformat "PNG"
    END
    ...
END