Spam: Re: [UMN_MAPSERVER-USERS] Strange imagetype/outputformat behaviour

[Dejan Gambin]

Frank,

No the declarations are not nested, I just made a mistake while pasting it
in the message.

I am trying to use a custom outputformat. I set something like:

IMAGETYPE "custom"
OUTPUTFORMAT
  NAME "custom"
  DRIVER "GD/PNG"
  MIMETYPE "image/png"
  IMAGEMODE RGB
  FORMATOPTION  INTERLACE=OFF
  TRANSPARENT OFF
END

...the resulting display is lower color quality than the first one and the
image size is 53KB. I tried the same without the quotation marks, it is the
same. Then I have tried different combinations using DRIVER "GDAL/PNG",
nothing works...then I tried using IMAGETYPE png without having OUTPUTFORMAT
png defined - the same. But when I replace both and set:

IMAGETYPE png
OUTPUTFORMAT
  NAME png
  DRIVER "GD/PNG"
  MIMETYPE "image/png"
  IMAGEMODE RGB
  FORMATOPTION  INTERLACE=OFF
  TRANSPARENT OFF
END

...the resulting display is better color quality and the image size is 303KB
!

So I really don't understand what is happening. I am using MS4W. Mapserv.exe
-v shows:

MapServer version 4.10.0 OUTPUT=GIF OUTPUT=PNG OUTPUT=JPEG OUTPUT=WBMP
OUTPUT=PDF OUTPUT=SWF OUTPUT=SVG SUPPORTS=PROJ SUPPORTS=FREETYPE
SUPPORTS=WMS_SERVER SUPPORTS=WMS_CLIENT SUPPORTS=WFS_SERVER
SUPPORTS=WFS_CLIENT SUPPORTS=WCS_SERVER SUPPORTS=SOS_SERVER SUPPORTS=THREADS
SUPPORTS=GEOS INPUT=JPEG INPUT=POSTGIS INPUT=OGR INPUT=GDAL INPUT=SHAPEFILE
DEBUG=MSDEBUG

The problem is that I don't know if the "better display result" is indeed
the best one I can get...

Thanks for any help

regards, dejan


> -----Original Message-----
> From: Frank Warmerdam [mailto:warmerdam at pobox.com] 
> Sent: Friday, July 13, 2007 4:50 PM
> To: Gambin Dejan
> Cc: MAPSERVER-USERS at LISTS.UMN.EDU
> Subject: Spam: Re: [UMN_MAPSERVER-USERS] Strange 
> imagetype/outputformat behaviour
> 
> Gambin Dejan wrote:
> > Hi,
> > 
> > Maybe someone can explain my imagetype/outputformat behaviour. I am 
> > displaying a set of RGB tif rasters. I set:
> > 
> > IMAGETYPE png
> > OUTPUTFORMAT
> >   NAME png
> >   DRIVER "GD/PNG"
> >   MIMETYPE "image/png"
> >   IMAGEMODE RGB
> >   FORMATOPTION  INTERLACE=OFF
> >   TRANSPARENT OFF
> > OUTPUTFORMAT
> >   NAME png8
> >   DRIVER "GD/PNG"
> >   MIMETYPE "image/png"
> >   IMAGEMODE PC256
> >   FORMATOPTION  INTERLACE=OFF
> >   TRANSPARENT OFF
> > END
> > END
> 
> Dejan,
> 
> I assume you don't really nest outputformat declarations like 
> you show above, right?
> 
> > The resulting 556x424 png image is 303KB in size. 
>  > When setting some user
> > defined IMAGETYPE/NAME, for example:
> > 
> > IMAGETYPE custom
> > OUTPUTFORMAT
> >   NAME custom
> > ...
> >  I get a much worse display,  and the png file is 53KB in 
> size. Is it 
> > allowed to set the custom names here?
> 
> Yes, it is allowed (in fact encouraged) to use your own 
> custom name for custom output format declarations.
> 
> > Also, I get the same result with png8 and png IMAGETYPE. I 
> don't know 
> > why? Maybe I am missing something?
> 
> I'm not sure your attempt to override the PNG output format 
> really worked.  I normally never use a pre-defined output 
> format name for a custom output format declaration in a mapfile.
> 
> Best regards,
> -- 
> ---------------------------------------+----------------------
> ----------
> ---------------------------------------+------
> I set the clouds in motion - turn up   | Frank Warmerdam, 
> warmerdam at pobox.com
> light and sound - activate the windows | http://pobox.com/~warmerdam
> and watch the world go round - Rush    | President OSGeo, 
> http://osgeo.org
> 
>