[Gvsig_english] transparent raster

[Victoria Agazzi]

Hi Michele!
Let see if I understand what you need...
Once you have your image in the view you can access  (by right click on the 
raster) to raster properties and there to the Transparency flap. You have to 
activate the Transparency you want to use: the one by pixel or the one that 
transparent all the image at once(Opacity). 
If you need to make transparent only the pixels in white colour (for 
instance), you hace to put (In Transparent by pixel) R=255, G=255 and B=255 
and apply it. 

I hope you this helps you. Bye. 


El Lunes 11 Diciembre 2006 22:49, Michele Zucali escribió:
> dear gvSIGers,
>
> 	I'd like to use some black/white geoTIFF above .shp poligonal
> layers, which are filled by various colors.
> In order to see the underling layers I need to have a transparent
> raster.
>
> How to make the raster transparent (i.e. make the white transarent) ?
> I did try using the transparent property to geotiff but it does not
> work or, better, I'm not able to make it working.
>
> ciao
> Michele
>
>
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-- 
Victoria Agazzi
Proyecto gvSIG - Grupo SIG-CAD
Consellería de Infraestructuras y Transporte
Comunidad Valenciana- España