[Chameleon] Setting quality for JPEG output

[Jacob Delfos]

Hi Tyler,

The imagetype set in chameleon.xml will determine what is being used, 
but it still listens to the settings in the mapfile. So if you want a 
jpeg with 60% quality, then you have to specify the quality setting in 
the output format, like this:

        OUTPUTFORMAT
                NAME jpeg
                DRIVER "GD/JPEG"
                MIMETYPE "image/jpeg"
                IMAGEMODE RGB
                EXTENSION "jpg"
                FORMATOPTION "QUALITY=60"
        END

I think with the current setting of "auto" for image type, it will use 
the imagetype setting in the mapfile as mapserver would do.

The customisation I posted was for chameleon version 1. I have changed 
it a little to automatically detect whether a raster exists in the 
layers being drawn (while also using the "forcejpg" parameter in the 
metadata), and to switch to jpeg based on that. Let me know if you want 
me to send it to you.

regards,

Jacob



-----Original Message-----
From: chameleon-bounces at lists.maptools.org
To: Jason Grimes
Cc: Chameleon User List
Sent: 7/9/2005 1:00 PM
Subject: Re: [Chameleon] Setting quality for JPEG output

Hi Jason,
In traditional MapServer applications, I've done it several using the
method you mentioned.  Are you saying that Chameleon actually checks the
IMAGETYPE from the map file?  I don't think so.  It ignores it on mine
and relies on the config/chameleon.xml image_type setting which is used
at map drawing time in the drawmap.php scripts.  As far as I can tell,
the only valid values for that setting are specific formats that GD
supports and not related to the map settings for IMAGETYPE.  My question
is really how to specify a quality setting for the image_type that
Chameleon uses, not how to set it in the map file.  If that makes any
sense...

Am I'm going mad or is this tricky for everyone else too?

Tyler

----- Original Message -----
From: Jason Grimes <jgrimes at gi.alaska.edu>
Date: Friday, July 8, 2005 3:40 pm
Subject: Re: [Chameleon] Setting quality for JPEG output

 > Hi Tyler,
 >
 > You set this with FORMATOPTION in the OUTPUTFORMAT block of your map
 > file.  Here is what I have mine set to...
 >
 >        IMAGETYPE jpeg
 >        IMAGECOLOR 255 255 255
 >                                                  
 >        OUTPUTFORMAT
 >                NAME jpeg
 >                DRIVER "GD/JPEG"
 >                MIMETYPE "image/jpeg"
 >                IMAGEMODE RGB
 >                EXTENSION "jpg"
 >                FORMATOPTION "QUALITY=100"
 >        END
 >
 > The IMAGETYPE must match the NAME in OUTPUTFORMAT.
 >
 > Jason G
 >
 > On Fri, 2005-07-08 at 11:20, Tyler Mitchell wrote:
 > > Jacob,
 > > I just discovered your drawmap mods for setting imagetype based
 > on layer
 > > metadata -- very good!
 > > http://lists.maptools.org/pipermail/chameleon/2004-
 > August/001253.html> It is just what I have been needing.
 > >
 > > Does anyone know if I can set the compression/quality for JPEG
 > output?
 > > I know how I'd do it in a map file, but $szImgType in
 > drawmap.php seems
 > > to only refer to image format, not sub-settings for that format.
 > >
 > > Can anyone give me some pointers?
 > >
 > > Tyler
 > > _______________________________________________
 > > Chameleon mailing list
 > > Chameleon at lists.maptools.org
 > > http://lists.maptools.org/mailman/listinfo/chameleon
 >
 > _______________________________________________
 > Chameleon mailing list
 > Chameleon at lists.maptools.org
 > http://lists.maptools.org/mailman/listinfo/chameleon
 >

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