[MapProxy] Getting different colors in WMS PNG layer from its Tile source

[Jason Lee]

Just to add some more details:

* I’m on the latest version of MapProxy.(1.11)
* The image coming back from the MapProxy WMS-C service is 8-bit and as the
component tiles all have slightly different pallettes, it’s perhaps no
surprise that there’s a colour compromise. In this case, white turning into
a exisiting pale grey.
* In summary, I’d like to have 8-bit paletted tiles as input and 24-bit
colour for WMS-C output.


On Thu, Aug 9, 2018 at 1:02 PM Jason Lee <jaslee.st at gmail.com> wrote:

> Hi,
> I have a ZXY map tile service (like OSM) which we use as the source of a
> layer in Mapproxy. However, when I request a WMS image of this layer, I can
> see that the colors are not exactly the same. I have read the docs
> regarding color settings and here are my globals:
>
> ######################
> globals:
>     mode: RGB
>     paletted: false
>     colors: 0
>     resampling_method: bicubic
> ######################
>
> The source tiles are 8bit RGB where the palette is different for each tile
> call. And here is a screen grab with the WMS image on the left and the
> original Tile on the right:
> https://pasteboard.co/HymQZnBo.png
>
> As can be seen, the road/path feature is white in the original tile BUT is
> grey in the WMS image.
>
> Any ideas?
>
> Jason
>
>
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