RIF: [mapguide-internals] changing mapguide's image type

[Walt Welton-Lair]

Think carefully about using any lossy image format for tiles.  To look correct adjacent tiles need to match at their borders...
 
Walt

	-----Messaggio originale----- 
	Da: mapguide-internals-bounces at lists.osgeo.org per conto di Trevor Wekel 
	Inviato: lun 2/5/2007 7:21 
	A: MapGuide Internals Mail List 
	Cc: 
	Oggetto: RE: [mapguide-internals] changing mapguide's image type
	
	


	Yes.  I think so.  The tiles and the overlay are two separate HTTP
	requests.  Tiles could be JPG and overlay could be PNG.  If you're using
	tiles, then the overlay should be PNG so transparency can be used to
	show the tiles underneath.
	
	I'm not sure this has been tested though.  It would be interesting to
	see if the various browsers can deal with overlaying a transparent PNG
	image over a non-transparent JPG.
	
	And I agree that image type and image size should ideally be set per
	base layer group.  However, that's a fair bit more work to implement
	(map definition, Web Studio, Studio, viewers) than adding configuration
	parameters for default behaviours.
	
	Thanks,
	Trevor
	
	-----Original Message-----
	From: mapguide-internals-bounces at lists.osgeo.org
	[mailto:mapguide-internals-bounces at lists.osgeo.org] On Behalf Of Paul
	Spencer (External)
	Sent: Monday, February 05, 2007 10:57 AM
	To: MapGuide Internals Mail List
	Subject: Re: [mapguide-internals] changing mapguide's image type
	
	Ideally the image type would be set per base layer group.
	
	Paul
	
	On 5-Feb-07, at 12:43 PM, Jason Birch wrote:
	
	>
	> So, if the tiling service image type could be specified, would that
	> allow Paul to use JPG for the tiles, and the interface would still use
	
	> PNG for the overlays?
	>
	> Jason
	>
	> -----Original Message-----
	> From: mapguide-internals-bounces at lists.osgeo.org
	> [mailto:mapguide-internals-bounces at lists.osgeo.org] On Behalf Of
	> Trevor Wekel
	> Sent: Monday, February 05, 2007 09:40
	> To: MapGuide Internals Mail List
	> Subject: RE: [mapguide-internals] changing mapguide's image type
	>
	>
	> Yes.  Andy is right.  If you're not using tiles then the image type
	> can be specified.  However, tile generation is currently hardcoded as
	> PNG.
	>
	> Thanks,
	> Trevor
	> _______________________________________________
	> mapguide-internals mailing list
	> mapguide-internals at lists.osgeo.org
	> http://lists.osgeo.org/mailman/listinfo/mapguide-internals
	
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	|Paul Spencer                          pspencer at dmsolutions.ca    |
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	|Chief Technology Officer                                         |
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