[Tilecache] Symbol image transparency problem

[Joel Bandibas]

Jez,

I had similar transparency problem before and solved it with the correct OUTPUTFORMAT setting of the Mapserver map file.  YOu did not show your OUTPUTFORMAT setting in your map file but I assume that the IMAGEMODE is RGB.  RGB mode does not support transparency (check Mapserver  documentation http://mapserver.org/mapfile/outputformat.html) . Yes, it is strange for even with that setting, transparency works in OpenLayers. Anyway, make the following changes and add the following OUTPUTFORMAT setting bellow in your map file and see if it works:

IMAGETYPE PNG
IMAGECOLOR  255 255 255

OUTPUTFORMAT
  NAME PNG
  DRIVER "GD/PNG"
  MIMETYPE "image/png"
  IMAGEMODE PC256
  EXTENSION "png"
  TRANSPARENT ON
END

Good day.

Joel
GSJ/AIST

  ----- Original Message ----- 
  From: Jez Walters 
  To: 'Jeff Konnen' 
  Cc: 'tilecache at openlayers.org' 
  Sent: Tuesday, August 10, 2010 6:55 PM
  Subject: RE: [Tilecache] Symbol image transparency problem


  Jeff,

   

  Thanks for the advice, but how exactly do I do as you suggest?  Do I need to set the "extension" parameter, and if so what value should I use - the online documentation doesn't indicate how to use this parameter.  I tried adding "extension=png", but that didn't change anything.

   

  Warm regards,

   

  Jez

   

  From: Jeff Konnen [mailto:jk at ubithere.lu]
  Sent: Monday 9 August 2010 19:13
  To: Jez Walters
  Subject: Re: [Tilecache] Symbol image transparency problem

   

  Hi Jez,

   

  if you want transparency using tilecache, be sure to set png and not jpeg in the tilecache config.

   

  Perhaps this might help

  Jeff

   

  On 09 Aug 2010, at 17:49, Jez Walters wrote:





  Hello TileCachers,

   

  I'm not sure if I posted this question correctly last time, so I'm trying again! ;-)

   

  I'm displaying UK Ordnance Survey MasterMap vector maps using OpenLayers, TileCache and MapServer. The maps display perfectly when I use just MapServer ( MapServer.jpg ), as well as when I also use OpenLayers. However, when I add TileCache to the mix, the various symbol images are no longer transparent ( TileCache.jpg ).

   

  I don't have that much experience of TileCache, so any help/explanation would be most appreciated!

   

  Jez


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