OFFSITE transparency question

[Eros Agosto]

Hi list,
i read on a previous post the hint to use the OFFSITE statement in the LAYER block for an image in order to make pixels having a certain value transparent.

I tried and it works.
The question is: in case of tiling many rasters, is it possible to use the statement once for the tile, or have I to use it for each Raster file?

for each raster file

LAYER
  NAME name
  DATA "name_rasterfile"
  TYPE RASTER
  STATUS ON
  OFFSITE 255 255 255
END

 or is it possible to use the following

LAYER                                                   
  NAME raster_tile                                            
  TILEINDEX "tileindex_shape.shp"                                   
  TILEITEM "location"                                   
  TYPE RASTER                                           
  STATUS ON                                             
  OFFSITE 255 255 255                                                                                 
END                                                     

I tried and it didn't work... I was wondering if i made something wrong, or this way can't just work.

Thanks in advance to anyone has suggestions

Eros


Eros Agosto
DITAG - Politecnico di Torino
C.so Duca degli Abruzzi, 24
10129 Torino - ITALIA
Telefono: +390115647719
Fax: +390115647699
eros.agosto at polito.it
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