[mapserver-users] How set transparency on a changed color raster

[Andrea Peri]

Hi,

After send the email I have find the explanation.
The solution was to set the
black --> white
to
black  --> near to white (but don't white)

Sorry for noise.




2013/7/29 Andrea Peri <aperi2007 at gmail.com>

> Hi,
>
> I have a black/white dataset with many rasters.
> I will use all of them with a catalog and set usually the white as
> transparency to see all as it was an unique raster.
>
> Now I have the nee to serve it also with changing the black to white.
> But I need to distinguish between the real white that should still be
> transparency and the white caming from black original pixel that should not
> be transparency.
>
> To allow this I'm try-ing to change
> the white to grey
> and
> black to white
> and also I try to set the transparency to the grey color.
>
> This is what I have do in the mapfile:
>
>     TYPE raster
>     TILEINDEX '/path-to-catalog/index_tiled'
>     PROCESSING "BANDS=1"
>     PROCESSING "NODATA=255"
>     METADATA
>       ....
>     END
>     OFFSITE 164 164 164
>     OPACITY 100
>     CLASSITEM "[pixel]"
>     CLASS
>       EXPRESSION ([pixel] = 0)
>       STYLE
>         COLOR 164 164 164
>       END
>     END
>     CLASS
>       EXPRESSION ([pixel] = 1)
>       STYLE
>         COLOR 255 255 255
>       END
>     END
>
>
> I set the offsite to the 164 164 164 but it don't seem to understand or
> use it.
> It seem using always the white original color.
>
> Any hint is welncome,
>
> thx,
>
>
>
> --
> -----------------
> Andrea Peri
> . . . . . . . . .
> qwerty àèìòù
> -----------------
>



-- 
-----------------
Andrea Peri
. . . . . . . . .
qwerty àèìòù
-----------------
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