[Chameleon] libpng warning

[Ken-ichi Ueda]

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/
>