Just to follow up, I found that kosmtik's overlay plugin can be run
with a negative value to create an underlay.  With opacity around 0.3,
the standard carto map from the public tileservers works great.  I
wish there was a public greyscale or b&w map though.  I found a
subscription service and quickly burned through my free account's
monthly quota.

For me kosmtik works better since it also has a go to JOSM plugin.

On Thu, Feb 24, 2022 at 2:14 PM Jonathan J. Bittner <[email protected]> wrote:
>
> the answer to my other question:
> in kosmtik, the --style-id option can be used to modify the project URL
>
>
> On Wed, Feb 23, 2022 at 10:23 PM Jonathan J. Bittner <[email protected]> 
> wrote:
>>
>> Thank you! That worked really, really well!
>>
>> On Wed, Feb 23, 2022 at 1:49 PM Michael Reichert <[email protected]> 
>> wrote:
>>>
>>> Hi Jonathan,
>>>
>>> Am 23.02.22 um 15:53 schrieb Jonathan J. Bittner:
>>> > I just started doing some ORM development and I'm using kosmtik.  While I
>>> > like it, it's sometimes hard to figure out where you are or more
>>> > appropriately, where you are trying to go.
>>> >
>>> > Some areas I can recognize by geography: single lines on peninsulas, major
>>> > rail hubs like Chicago or Kansas City, by shape/lines once you know the
>>> > area, etc.  I can also get a permalink from ORM and put the coordinates
>>> > into the url for kosmtik.
>>> >
>>> > However, I was wondering if there was a way to get the ORM background
>>> > (Mapnik Grayscale) or similar to display behind the renderings from the 
>>> > MML
>>> > file.  There seems to be quite a few additional plugins for kosmtik but
>>> > it's a bit confusing as to what they do or how they work.  I've seen ones
>>> > that will render side by side or over but not under.  Not sure if I'd 
>>> > fully
>>> > need to render the "world" or if the grayscale tiles could be pulled in
>>> > from an existing tileserver.
>>>
>>> I often run https://github.com/geofabrik/tileserver-demosite where I
>>> configure the layer served by Kosmtik locally and tiles from osm.org.
>>>
>>> Even more often, I try out changes using Nik4, i.e. I render static map
>>> images (2048x2048 px).
>>>
>>> Best regards
>>>
>>> Michael
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