[MapProxy] How do I get these tile sets overlayed with transparency?

[Michael Heerdegen]

Daniel Cebulla via MapProxy <mapproxy at lists.osgeo.org> writes:

> Is there a chance, that the term you are looking for in your use case
> is "opacity" instead?? ...

Of course.  Thank you for mentioning that point.

> From the docs:
>
> opacity
> Configures the opacity of a layer or cache. This value is used when the source or cache
> is placed on other layers and it can be used to overlay non-transparent images. It does
> not alter the image itself, and only effects when multiple layers are merged to one
> image. The value should be between 0.0 (full transparent) and 1.0 (opaque, i.e. the
> layers below will not be rendered).

I played with it for quite a while and didn't get it work.  Specifying
opacity is not rejected (don't get a warning) but it has no effect.
There are opacity related bugs, but maybe I'm trying wrong.  Tried a
lot, though.

There are also "transparent_color" and "transparent_color_tolerance",
but also these don't have an effect.  Tried different combinations with
different numbers of caches.

I attach the end result of my today's trials, if somebody wants to play
with it... Is there something obviously wrong?

Thx, Michael.


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