[Tilecache] Symbol image transparency problem

Wed Aug 11 09:57:11 EDT 2010

Marco,

I've already tried that and I'm afraid it makes no difference.  Is it time to raise a TileCache bug?

Regards,

Jez

-----Original Message-----
From: Marco Nijdam [mailto:marco at west.nl]
Sent: Wednesday 11 August 2010 13:57
To: Jez Walters
Subject: RE: [Tilecache] Symbol image transparency problem

Dear Jez,

You may want to try adding "&TRANSPARENT=true" to the URL parameters
of the WMS service URL in the tilecache.cfg file.

Kind regards,
--
-- Marco Nijdam
--

As quoted from Jez Walters:
> Marco,
>
>
> My sample configuration is a cut-down version of my current 'live'
> mapfile, which is over 1500 lines long and is split over several files.
> I'll see if I can knock up a better example that demonstrates the problem
> I'm still having.
>
> In the meantime, I tried adding "extension=png" to my tilecache.cfg and
> adding "format: 'image/png'" to my OpenLayers invocation (as well as
> flushing the tile cache), but this had no effect.  The comments in the
> default tilecache.cfg indicate that "extension=png" is the default
> setting, so I guess adding this wouldn't make a difference anyway?
>
>
> Warm regards,
>
>
> Jez
>
>
> -----Original Message-----
> From: Marco Nijdam [mailto:marco at west.nl]
> Sent: Tuesday 10 August 2010 13:58
> To: Jez Walters
> Cc: 'tilecache at openlayers.org'
> Subject: RE: [Tilecache] Symbol image transparency problem
>
> Dear Jez,
>
> In your config files, I do not see the underlying topographic layer you
> had in your original screen capture.
> If you tilecache only the symbols, and the format would not be PNG,
> I would expect the background topo layer to be completely hidden.
> Since the problem you originally showed was the symbols only to be
> non-transparent, but not the room between the symbols,
> I'm not sure if we have the complete solution.
>
> Based on the config files you provided, I agree with Jess you need to add
> "extension=png" to you tilecache.cfg, in the [ipmap] section.
>
> You also need to request the tiles as PNG, by specifying the format
> in the OpenLayers.Layers.WMS constructor, as part of the list of
> options in the third argument. So
>
>     layer = new OpenLayers.Layer.WMS("Map",
>                                   urls,
>                                   {
>                                     layers: 'ipmap',
>                                     format: 'image/png'
>                                   });
>
> Finally you need to remove all existing tiles, to make sure they are
> properly generated.
>
> Kind regards,
> --
> -- Marco Nijdam
> --
>
> As quoted from Jez Walters:
>> Marco,
>>
>> It took some work, but I've pared it down to the attached mapfile and
>> tilecache.cfg.  For completeness I've enclosed my OpenLayers
>> configuration
>> and the image file too, just in case either of these are the culprit.
>>
>> Any thoughts as to where I'm going wrong - or is it a bug in TileCache?
>>
>> Jez
>>
>>
>> -----Original Message-----
>> From: Marco Nijdam [mailto:marco at west.nl]
>> Sent: Monday 9 August 2010 19:56
>> To: Jez Walters
>> Cc: tilecache at openlayers.org
>> Subject: Re: [Tilecache] Symbol image transparency problem
>>
>> Dear Jez,
>>
>> Could you please give more information on you setup?
>> E.g. mapfile, tilecache.cfg file.
>> Are all layers tiled into one tilecache, or are you overlaying multiple
>> layers?
>>
>> Kind regards,
>> --
>> -- Marco Nijdam
>> --
>>
>> As quoted from Jez Walters:
>>>
>>> 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 (
>>> http://osgeo-org.1803224.n2.nabble.com/file/n5389483/MapServer.jpg
>>> 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 (
>>> http://osgeo-org.1803224.n2.nabble.com/file/n5389483/TileCache.jpg
>>> TileCache.jpg  ).
>>>
>>> I don't have that much experience of TileCache, so any
>>> help/explanation
>>> would be most appreciated!
>>>
>>> Jez
>>> --
>>> View this message in context:
>>> http://osgeo-org.1803224.n2.nabble.com/Symbol-image-transparency-problem-tp5389483p5389483.html
>>> Sent from the TileCache mailing list archive at Nabble.com.
>>> _______________________________________________
>>> Tilecache mailing list
>>> Tilecache at lists.osgeo.org
>>> http://lists.osgeo.org/mailman/listinfo/tilecache

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