[Chameleon] libpng warning

[Julien-Samuel Lacroix]

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
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> Chameleon at lists.maptools.org
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-- 
Julien-Samuel Lacroix
Mapgears
http://www.mapgears.com/