It's not a question of OpenLayers. It's up to the browsers. OpenLayers does only set the src of the image tag. The browsers are responsible for displaying the images.
<img src="urltoimage"> As far a i know browsers support png, gif and jpg, but absolutly not tif. Arnd -----Ursprüngliche Nachricht----- Von: [email protected] [mailto:[email protected]] Im Auftrag von michaeladamkatz Gesendet: Samstag, 29. Oktober 2011 13:25 An: [email protected] Betreff: [OpenLayers-Users] using tiff (or other uncompressed file type) as the format for a WMS layer I am using OpenLayers with a custom python server, and in my case the server is actually running on the local machine. I am using a custom WMS layer. I previously was using format: "image/png" as the format of the WMS layer. The server would return the contents of a .png file, and it all worked. In order to speed up the server a bit, I would like to use an uncompressed file format instead of .png, because I have discovered that simply compressing the .png file is taking the majority of the time in serving a request, in many cases. (I am using the Python Image Library to actually write the image data. My understanding is that there isn't an option for me to create a "non-compressed" .png file in order to save on compression time. If there was such an option I'd be done.) I thought I'd be able to use the .tiff format to achieve this. Indeed, on the server side I can very quickly create the TIFF output (again, this is using PIL): f = StringIO.StringIO() composite_image.save( f, "TIFF" ) # saves much faster than "PNG" bytes = f.getvalue() f.close() return bytes But it seems like the OpenLayers client isn't happy with that. It does not display the .tiff output, and instead makes repeated requests to the server (presumably trying to get what it considers a valid response, since I have OpenLayers.IMAGE_RELOAD_ATTEMPTS = 3;). Below is the relevant OpenLayers code. Is it possible to serve my WMS layer as .tiff in this way? If not, what uncompressed file format can I use? OpenLayers.Layer.MyWms = OpenLayers.Class( OpenLayers.Layer.WMS, { . . . wrapDateLine: true, CLASS_NAME: "OpenLayers.Layer.MyWms" }); var localWMSOverlay = new OpenLayers.Layer.MyWms( "Local WMS Overlay", "http://localhost/wms";, { layers: "basic", format: "image/tiff" }, { isBaseLayer : false, singleTile: true } ); map.addLayers( [ gmap, localWMSOverlay ] ); -- View this message in context: http://osgeo-org.1803224.n2.nabble.com/using-tiff-or-other-uncompressed-file -type-as-the-format-for-a-WMS-layer-tp6943119p6943119.html Sent from the OpenLayers Users mailing list archive at Nabble.com. _______________________________________________ Users mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/openlayers-users _______________________________________________ Users mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/openlayers-users
