[mapserver-users] multiple transparent colours

[Rahkonen Jukka]

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 Norte  wrote:
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

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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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