[Tilecache] Symbol image transparency problem

Wed Aug 11 10:24:51 EDT 2010

Dear Jez,

As quoted from Jez Walters:
> I've already tried that and I'm afraid it makes no difference.  Is it time
> to raise a TileCache bug?

No, since we don't know the cause of the problem yet. Please make a
simple configuration with all relevant layers that explains the problem.
As mentioned, your earlier configuration didn't contain a topographic
layer, so could not explain the actual problem.

Kind regards,
--
-- Marco Nijdam
--

>
>
> -----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
>
>
> The information transmitted is intended only for the person
> or entity to which it is addressed and may contain
> confidential and/or privileged material. If you are not the
> addressee, any disclosure, reproduction, copying,
> distribution, or other dissemination or use of this
> communication is strictly prohibited. If you have received
> this transmission in error please notify the sender
> immediately and then delete this email.
>
> Any representations or commitments expressed in this email
> are subject to contract.
>
> This message has been scanned for viruses and dangerous
> content. However, it is essential that the recipient also
> checks this message using commercially available mail
> scanning and anti-virus software. IPL Information Processing
> Limited accepts no liability for any loss or damage resulting
> from any virus or other dangerous content in this message.
>
> IPL Information Processing Limited is registered in England
> and Wales under company registration number 1418818.
> Registration took place at Cardiff on 10 May 1979. IPL
> Information Processing Limited's registered office and
> normal place of business is Eveleigh House, Grove Street,
> Bath, BA1 5LR, United Kingdom. IPL is also registered for
> Value Added Tax (VAT) under registration number GB 601 2931 83.
>
>