[Chameleon] libpng warning

[Julien-Samuel Lacroix]

If you did not compile your php with the same libpng as mapserver that 
can be the source of the problem. BTW, did you heard of FGS? It's a MS4W 
equivalent for Linux.

http://www.maptools.org/fgs/

That would save you the compilation trouble.

Julien

Ken-ichi Ueda wrote:
> Thanks for the reply, Julien.  I tried inserting the IMAGETYPE into
> the mapfile, but it didn't do anything.  I didn't think you needed it
> if you specified an OUTPUTFORMAT.  libpng on this machine is at
> version 1.2.8, and Mapserver was definitely compiled against that
> version.  It is possible that PHP was compiled against a different
> version of libpng, though.  I'll have to look into that.  As I
> mentioned, testing with the CGI and with plain mapscript does not
> generate this error.
> 
> -Ken-ichi
> 
> On 3/11/06, Julien-Samuel Lacroix <jlacroix at mapgears.com> wrote:
> 
>>Hi,
>>Just to try to find where the problem reside. What imagetype does
>>Chameleon use? You can see it in chameleon/config/chameleon.xml. Then
>>add in your mapfile
>>IMAGETYPE <insert_yours_here>
>>
>>Then retest with mapscript or mapserver CGI. Does the error appear now?
>>
>>I suspect that your mapserver installation use a broken libpng. If
>>version of libpng do you use?
>>
>>Julien
>>
>>Ken-ichi wrote:
>>
>>>Hi all,
>>>
>>>My Chameleon app is generating a whole lot of warnings in Apache's
>>>error_log file, and they look like this:
>>>
>>>libpng warning: tRNS chunk not allowed with alpha channel
>>>
>>>Actually, about 140 lines of that per page load.  This is on a machine
>>>running Mapserver 4.8.1, PHP 5.0.5, Apache 2.0.55, and Chameleon 2.2.
>>>Here's a mapfile that will cause the error:
>>>
>>>MAP
>>>   NAME "test"
>>>   STATUS ON
>>>   EXTENT -363827 -615083 548549 481459
>>>   SIZE 410 500
>>>   SHAPEPATH "/path/to/data/"
>>>   SYMBOLSET "/path/to/symbols.sym"
>>>   FONTSET "/path/to/fonts.txt"
>>>   UNITS METERS
>>>   WEB
>>>       IMAGEPATH "/path/to/ms_tmp/"
>>>       IMAGEURL "/ms_tmp/"
>>>   END
>>>
>>>   PROJECTION
>>>       "proj=aea"
>>>       "ellps=clrk66"
>>>       "datum=NAD27"
>>>       "lon_0=-120"
>>>       "lat_1=34"
>>>       "lat_2=40.5"
>>>       "x_0=0"
>>>       "y_0=-4000000"
>>>       "units=m"
>>>   END
>>>   OUTPUTFORMAT
>>>       NAME "png"
>>>       MIMETYPE "image/png"
>>>       DRIVER "GD/PNG"
>>>       EXTENSION "png"
>>>       IMAGEMODE RGB
>>>   END
>>>
>>>   LAYER
>>>       NAME "Water"
>>>       GROUP "hidden"
>>>       METADATA
>>>         "legendvis"  "hidden"
>>>       END
>>>       STATUS DEFAULT
>>>       DATA "water"
>>>       TYPE POLYGON
>>>       PROJECTION
>>>           "proj=aea"
>>>           "ellps=clrk66"
>>>           "datum=NAD27"
>>>           "lon_0=-120"
>>>           "lat_1=34"
>>>           "lat_2=40.5"
>>>           "x_0=0"
>>>           "y_0=-4000000"
>>>           "units=m"
>>>       END
>>>       CLASS
>>>           STYLE
>>>               COLOR 178 214 214
>>>           END
>>>       END
>>>   END
>>>END
>>>
>>>
>>>I've tested this with the CGI and with a simple, non-Chameleon PHP
>>>mapscript app and neither of those generate this error.  Note that these
>>>warnings don't seem to have any effect on the Chameleon app itself, they
>>>just fill up the log file.
>>>
>>>Has anyone seen this error before, or have any clue as to what might be
>>>going on?
>>>
>>>-Ken-ichi
>>>_______________________________________________
>>>Chameleon mailing list
>>>Chameleon at lists.maptools.org
>>>http://lists.maptools.org/mailman/listinfo/chameleon
>>
>>--
>>Julien-Samuel Lacroix
>>Mapgears
>>http://www.mapgears.com/
>>

-- 
Julien-Samuel Lacroix
Mapgears
http://www.mapgears.com/