wmts tile as transparent overlay

[jan.gl...@gmail.com]

I just wonder if someone have a solution for this:

I'd like to overlay an map (e.g. ch.swisstopo.pixelkarte-grau) with the hillshading of ch.swisstopo.swissalti3d-reliefschattierung. I can set the opacity of the overlaying map to e.g. 0.5 but this is not the result I like. I'd like to have the black parts of hillshading map as black (and opaque), the white parts as absolut transparent (and the gray parts as black and 50% transparent). do you understand what I mean?

The tiles of ch.swisstopo.swissalti3d-reliefschattierung are .PNG so transparency would be possible. Do I get the tiles as black/transparent tiles?

Here some code: http://codepen.io/dddesign/pen/PZmEZV

and attached what my desired result (combined in photoshop)

[Moullet Cédric swisstopo]

Hello,

Without having tested, it should be possible to use an ol.source.Raster and to manage the pixels of the relief layer on the fly

See http://stackoverflow.com/questions/34149816/desaturate-tile-layer-in-openlayers-3  and http://openlayers.org/en/v3.12.1/examples/color-manipulation.html

I hope this helps,

Cédric  

 

De : geoadm...@googlegroups.com [mailto:geoadmin-a...@googlegroups.com] De la part de jan.gl...@gmail.com
Envoyé : dimanche 10 janvier 2016 18:12
À : GeoAdmin API <geoadm...@googlegroups.com>
Objet : wmts tile as transparent overlay

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[jan.gl...@gmail.com]

thanks for the tip, it's working now, see here:

http://codepen.io/dddesign/pen/PZmEZV

by the way: with the operation function I generate the hillshade with more contrast.

[jan.gl...@gmail.com]

just wonder if we can also blur the image/pixels. I found this:

http://www.phpied.com/canvas-pixels-2-convolution-matrix/

do someone has an idea how this can be transleted to/with openlayers?

j

Am Sonntag, 10. Januar 2016 18:12:00 UTC+1 schrieb jan.gl...@gmail.com:

[jan.gl...@gmail.com]

got it, if you are interested in check here:

http://codepen.io/dddesign/pen/NxgOmg

it needs some time to calculated the blur (the bigger the matrix is the longer it takes...)

you can switch with the <>-button between blured and normal hillshading

j

Am Sonntag, 10. Januar 2016 18:12:00 UTC+1 schrieb jan.gl...@gmail.com: