[Chameleon] Image format of map

[Paul Spencer]

can you send me the proposed changes so I can take a look at them?

Paul

Delfos, Jacob wrote:
> Paul,
> A while ago I made a change that allows the image format to change on 
> the fly (based on layer-use). It wasn't very hard to do, so it could 
> probably be controlled by the user during a session easily.
> 
> I think it might be useful to automatically force 24bit colours when a 
> full-colour dataset is loaded. This is how I have it set up for our 
> sites. By default it uses 8bit gif. It picks up a metadata tag which 
> specifies whether to force 24bit jpeg. But perhaps chameleon could 
> detect automatically whether a full-colour image is in use.
> 
> Maybe the config file could be changed, such that you can set 
> "image_type" to "auto", so that it will do that.
> regards,
> Jacob
> JACOB DELFOS
> SPATIAL INFORMATION ANALYST
> Maunsell Australia Pty Ltd
> 629 Newcastle Street, WA 6007
> PO Box 81, WA 6902
> Leederville
> Western Australia
> ABN 20 093 846 925
> Tel + 61 8 9281 6185
> Fax + 61 8 9281 6297
> _jacob.delfos at maunsell.com_ <mailto:jacob.delfos at maunsell.com>
> -----Original Message-----
> From: _chameleon-bounces at lists.maptools.org_ 
> <mailto:chameleon-bounces at lists.maptools.org> 
> [_mailto:chameleon-bounces at lists.maptools.org_] On Behalf Of Paul Spencer
> Sent: Thursday, 28 April 2005 9:57 PM
> To: Bart van den Eijnden
> Cc: _chameleon at lists.maptools.org_ <mailto:chameleon at lists.maptools.org>
> Subject: Re: [Chameleon] Image format of map
> I think we need a way to control this from the application rather than 
> only being able to do it through the configuration file. In fact, you 
> actually can change it in the index.phtml file but it requires some 
> mapscript to do it.
> 
> The original reason for having it in the configuration file was because 
> we were working only with Web Map Context documents so there was no map 
> file to start with ... hence no image format.
> 
> I think a reasonable change would be for chameleon to use the map file 
> image format and to move this configuration parameter into the cwc2.xml 
> file so that it only affects the service instance mode.
> 
> Comments and suggestions welcome
> Paul
> Bart van den Eijnden wrote:
>  > Hi,
>  >
>  > did you check the Chameleon config file (chameleon.xml)?
>  >
>  > <context-param>
>  > <param-name>image_type</param-name>
>  > <param-value>PNG</param-value>
>  > <description>Output image type (eg: PNG, GIF). Must be uppercase. 
> This image format MUST be supported by your browser and GD (on the 
> server). Please don't change that value unless you know what you'r 
> doing.</description>
>  > </context-param>
>  >
>  > The param value normally corresponds with the NAME of an output 
> format object from your MAP file which you want to use.
>  >
>  > Best regards,
>  > Bart
>  >
>  > Bart van den Eijnden
>  > Syncera-ITSolutions
>  > Postbus 270
>  > 2600 AG DELFT
>  >
>  > tel.nr.: 015-7512436
>  > email: _BEN at Syncera-ITSolutions.nl_ <mailto:BEN at Syncera-ITSolutions.nl>
>  >
>  >
>  >>>>Dirk Jesko <_ml.dje at geocontent.de_ <mailto:ml.dje at geocontent.de>> 
> 04/28/05 09:52am >>>
>  >
>  > Hi,
>  >
>  > Simple question: How do I choose the format for the map image
>  > generated by a MapDHTML widget? Even though, my mapfile only specifies
>  > jpeg, I always get a 256 color PNG. Somehow, I can not find a way to
>  > change this. Since I have layers with true color imagery, 256 colors
>  > are insufficient.
>  >
>  > Thanks,
>  > Dirk Jesko
>  >
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|Paul Spencer                           pspencer at dmsolutions.ca   |
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|Applications & Software Development                              |
|DM Solutions Group Inc                 http://www.dmsolutions.ca/|
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