[OpenLayers-Users] Applying filters to WMS-C images

[Olivier Terral]

Hi Laurent ,

I don't know what is your constraints in this project but if you use WMS and a Raster layer may be you should have look to SLD spec.

I know you can do that with geoserver : http://docs.geoserver.org/latest/en/user/styling/sld-cookbook/rasters.html

and probably with all others WMS server that manages RatserSymbolizer and ColorMap.

Le 22 juin 2012 à 12:31, Laurent BAEY a écrit :

> Hi,
> 
> I want to be able to use filters on images from a WMS-C layer (e.g.
> grayscale filter) and I want it cross browser.
> 
> For now, I use this css properties, with a class I add on the tileloaded
> event :
> 
> /* Chrome 19+ */
> -webkit-filter: grayscale(1);
> /* IE */
> -ms-filter: "progid:DXImageTransform.Microsoft.BasicImage(grayscale=1)"
> filter: 'progid:DXImageTransform.Microsoft.BasicImage(grayScale=1)';
> filter: gray();
> /* FF 3.5+ */
> filter: url("./resources.svg#desaturate");
> 
> with resources.svg as follow :
> 
> <?xml version="1.0" encoding="UTF-8"?>
> <svg version="1.1"
>     baseProfile="full"
>     xmlns="http://www.w3.org/2000/svg">
>    <filter id="desaturate">
>        <feColorMatrix type="matrix" values="0.3333 0.3333 0.3333 0 0
>                                             0.3333 0.3333 0.3333 0 0
>                                             0.3333 0.3333 0.3333 0 0
>                                             0      0      0      1 0"/>
>    </filter>
> </svg>
> 
> This svg filter doen't work on images with chrome < 19 and safari, it
> needs to be an <image> svg element to work.
> 
> Has anybody managed to display a WMS layer in a svg <image> element ? Or
> maybe grayscale images with any other method ?
> 
> Note that I can't use the canvas method with the OL 2.11 version I have to
> use. (tile.getCanvasContext() doesn't exist)
> 
> Thanks
> 
> Laurent
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Olivier Terral


 
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