[mapserver-users] multiple transparent colours

[Stephen Woodbridge]

Frank,

Would it be possible to make mapserver pick up the NODATA value from the 
gdal source file. Maybe using a keyword like "OFFSITE AUTO". This would 
be especially useful when using a tileindex.

Any thoughts on this? Should I create a ticket for something like this?

-Steve W

On 5/9/2012 9:36 AM, Rahkonen Jukka wrote:
> Hi,
> Perhaps you cannot literally set a colour as transparent in a tiff but
> for sure you can define a nodata value and then applications can make
> nodata pixels transparent. That is the most normal way to do it with
> Mapserver and OFFSITE. I believe that Mapserver does not even care if
> tiff has a nodata tag set but you can give whatever value for offsite in
> a mapfile.
> I have not played at all with alpha, but perhaps there is some way to
> give a list of pixel values which should be transparent and convert them
> all to a suitable alpha channel value.
> -Jukka Rahkonen-
>
>     Fernando Nortewrote:
>     Hi Christoph,
>
>     I try to understand, how did you set the specific color to
>     transparent in a TIFF?
>     For raster you can set the level of transparency/opacity to the
>     image not to a color.
>
>     Att,
>
>     *Fernando Norte*
>
>     Desenvolvedor SIGWeb
>
>     tel.(31) 2533.9900
>
>     cel.(31) 9119.8814
>
>     skype: fernandoglobalgeo
>
>     	
>
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>
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>
>
>     2012/5/9 Christoph Schumacher
>     <christoph.schumacher at pbs-schumacher.de
>     <mailto:christoph.schumacher at pbs-schumacher.de>>
>
>         Hello everybody,
>
>         I have a problem setting up my wms.
>         I have multiple tiff images that have different colours to be
>         set up as transparaent.
>
>         With the offsite parameter I can only set one colour transparent.
>
>         Now my question is: Is there a way to make various colour
>         transparent??
>
>
>         best wishes and thank you very much
>
>         christoph
>
>
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