AW: [Mapserver-users] transparent background raster (tif)

[Christina Biakowski (CCGIS)]

Hello,
perhaps you have already tried this: I think you have to find out the
colour-index of your background-color and set it to transparent,
either in the general layer section using the parameter OUTPUT with the
index of your background-color like e.g.

LAYER
 NAME DGK1
 TYPE RASTER
 DATA "520911.tif"
 STATUS ON
 OFFSITE 0	#0 refers to the colour-index that has to be displayed
transparent
...

or defining an explicit class. For Rasters the classitem must be set to
VALUE.

LAYER
...
CLASSITEM "VALUE"
...
CLASS
	EXPRESSION "1"	#1 refers to the colour-index
 	COLOR -1 -1 -1	#transparent
END
...
The colour-index you could for example find out by using the ArcGis
Layer-Properties.
The described way works with Mapserver 3.6x, but I remember to have read
that in 3.7 it is implemented in a different way.
I hope this helps!

Best regards, Christina


-----Ursprüngliche Nachricht-----
Von: mapserver-users-admin@lists.gis.umn.edu
[mailto:mapserver-users-admin@lists.gis.umn.edu]Im Auftrag von Rosangela
Silva
Gesendet: Montag, 26. Mai 2003 16:44
An: mapserver-users@lists.gis.umn.edu
Betreff: Re: [Mapserver-users] transparent background raster (tif)


I could not send the files (large size) but
I'm sending an example in mapserver to you understand
better the problem.
Thanks
Rosāngela


> Hello,
>
> I'm having a problem to show some images that have a black background.
> I need to see them with transparent background, is it possible in
Mapserver?
> They are in tiff format. I generate a tiff with transparent background,
that
> can be seen using ArcGis, for example, (please, look the examples
attached).
> I'm using tile index for display this images. But is there some property
> that can
> be set to background be transparent??
>
>
> Thansk
> Rosāngela
>
> _______________________________________________
> Mapserver-users mailing list
> Mapserver-users@lists.gis.umn.edu
> http://lists.gis.umn.edu/mailman/listinfo/mapserver-users
>

_______________________________________________
Mapserver-users mailing list
Mapserver-users@lists.gis.umn.edu
http://lists.gis.umn.edu/mailman/listinfo/mapserver-users