[mapserver-users] multiple transparent colours

Wed May 9 23:45:31 PDT 2012

 hi everybody,

first i have to say thank you for all the answers.

I tried the RGBA way by defining a RGBA Palett file with quadrupels (e.g. 0,0,0,0) for the RGBA values of my transparent colours. 
It´s the first time for me using RGBA so maybe I´m on the wrong way, but how do i define the transparency in the Layer section???

best wishes and thank you
christoph

> Hi,
> 
> Just came into my mind that I have had problems with OFFSITE and tileindex. It 
> makes the desired pixel value transparent with WMS but not with WCS. At least is 
> was so in the past. I have not produced WCS lately. The workaround was to make a VRT 
> file from with gdalbuildvrt and use that as input for the WCS mapfile. That way 
> nodata worked as it should and we got proper images out of WCS even with warped 
> source images. I am not sure if I ever made a ticket from that. Perhaps not or then 
> just nobody ever reacted.
> 
> So I suppose that "OFFSITE AUTO" happens already if you use VRT as input instead of 
> tileindex. I have not seen big difference in speed between tileindex and VRT. 
> However, I use normally tileindex system because I can open and manage the index 
> files with GIS programs.
> 
> -Jukka Rahkonen-
> 
> Stephen Woodbridge wrote:
>> Lähetetty: 9. toukokuuta 2012 16:45
>> Vastaanottaja: mapserver-users at lists.osgeo.org 
>> Aihe: Re: [mapserver-users] multiple transparent colours
>> 
>> 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
>> >
>> > 	
>> >
>> > Endereço: Alameda do Ingá, 88, 6º andar, Vale do Sereno
>> >
>> > Nova Lima/MG - CEP: 34.000-000
>> >
>> > www.globalgeo.com.br <http://www.globalgeo.com.br/>
>> >
>> > "O presente documento pode conter material confidencial ou seu
>> > sigilo é protegido por lei.
>> > Quaisquer informações nele contida são destinadas exclusivamente
>> > ao(s) seu(s) destinatário(s)
>> > não devendo em nenhuma hipótese ser repassado a terceiros".
>> >
>> >
>> >
>> >
>> > 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
>> >
>> >
>> > _______________________________________________
>> > mapserver-users mailing list
>> > mapserver-users at lists.osgeo.org 
>> > mailto:mapserver-users at lists.osgeo.org 
>> > http://lists.osgeo.org/mailman/listinfo/mapserver-users
>> >
>> >
>> >
>> >
>> > _______________________________________________
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>> > http://lists.osgeo.org/mailman/listinfo/mapserver-users
>> 
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Freundliche Grüße
planungsbüro schumacher

Im Auftrag

gez. Christoph Schumacher

Telefon 02262 7205-13

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