[mapserver-users] Using IMAGECOLOR to create a transparency mask

[gwaldron]

Roger, Andre,

Thanks for your suggestions .... unfortunately none of these ideas worked
for me. I will keep banging away at it and let me know if I discover
anything.

Glenn




Roger André wrote:
> 
> Hey guys,
> 
> Have a try resetting your OUTPUTFORMAT to this:
> 
>   OUTPUTFORMAT
>     NAME 'AGGA'
>     DRIVER AGG/PNG
>     MIMETYPE "image/png"
>     IMAGEMODE RGBA
>     EXTENSION "png"
>     FORMATOPTION "INTERLACE=OFF"
>   END
> 
> Transparency works for me with this.
> --
> 
> On Wed, Feb 4, 2009 at 11:05 AM, Mike Dunham-Wilkie
> <mike at barrodale.com>wrote:
> 
>>
>> Sorry Glenn, I don't have an answer, but I've been dealing with the same
>> problem.
>>
>> Transparency seems to work as expected with:
>>
>> OUTPUTFORMAT
>>   NAME png24
>>   DRIVER "GD/PNG"
>>   MIMETYPE "image/png"
>>   IMAGEMODE RGBA
>>   EXTENSION "png"
>>   TRANSPARENT ON
>> END
>>
>> but not with:
>>
>> OUTPUTFORMAT
>>   NAME 'AGG'
>>   DRIVER AGG/PNG
>>   IMAGEMODE RGBA
>>   FORMATOPTION "PALETTE_FORCE=TRUE"
>>   FORMATOPTION "PALETTE="
>>   TRANSPARENT ON
>> END
>>
>> It's as if with AGG/PNG the TRANSPARENT ON setting is completely ignored.
>>
>> Mike
>>
>>
>>
>> At 10:52 AM 04/02/2009, gwaldron wrote:
>>
>>
>> I'm trying to use IMAGECOLOR to try to force all pixels of a certain
>> color
>> to
>> become fully transparent, but I am not having any luck getting it to
>> work.
>>
>> My output format it AGG/PNG, RGBA, TRANSPARENT ON.
>>
>> I have a shapefile layer set to COLOR 0 50 100, and my map-level
>> IMAGECOLOR
>> set to the same. I was hoping all the polys in the shapefile would render
>> as
>> transparent pixels, but no luck; they just show up as blue polygons.
>>
>> What am I doing wrong here? Thanks.
>>
>> -----
>> Glenn Waldron * Pelican Mapping * gwaldron at pelicanmapping.com * +1 703
>> 652
>> 4791
>> --
>> View this message in context:
>> http://n2.nabble.com/Using-IMAGECOLOR-to-create-a-transparency-mask-tp2270688p2270688.html
>> Sent from the Mapserver - User mailing list archive at Nabble.com.
>>
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>>  ----------------------------------------------
>> Michael Dunham-Wilkie, M.Sc., M.P.A.
>> Senior Database Analyst
>> Barrodale Computing Services Ltd.
>> Tel: (250) 472-4372 Fax: (250) 472-4373
>> Web:  http://www.barrodale.com
>> Email: mike at barrodale.com
>> ----------------------------------------------
>> Mailing Address:
>> P.O. Box 3075 STN CSC
>> Victoria BC Canada V8W 3W2
>>
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>> University of Victoria
>> Victoria BC Canada V8W 3W2
>> ----------------------------------------------
>>
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>>
> 
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> 


-----
Glenn Waldron * Pelican Mapping * gwaldron at pelicanmapping.com * +1 703 652
4791
-- 
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