I access this WMS (link) which is returned in only .png/.jpg/.gif in a pre-defined colour-scale. I want to change those colours and am asking myself if I can set up a custom style for the rasters. I'm now assuming the answer would be a bald 'no, it's a raster'. But I'm looking for maybe a work-around? I can also access the point-features which it is based on (link). Can I use some sort of styling or filters to colour the cells according their elevation ('on-the-fly')?
For more clarity I have the WMS running on here. The web page is in Dutch and the layer you should look for is 'Lodingen' (enabled by default).