[MapProxy] Issue with WMS Imagery Recoloring

[Oliver Tonnhofer]

On 13.04.2011, at 22:34, Tom Batkiewicz wrote:

> Hi all,
> 
> Having an issue with some images I'm caching and re-aligning using mapproxy 1.0.
> 
> When the query goes out from mapproxy, it looks something like the following.  Everything looks fine on the source/cache side as this is what I expect to see (the image in question is a heightmap)
> http://wms.jpl.nasa.gov/wms.cgi?request=GetMap&layers=us_ned&srs=EPSG:4326&width=300&height=300&format=image/png&styles=feet_short_int&bbox=-125.000000,7.333333,-82.333333,50.000000
> http://img600.imageshack.us/img600/4759/wmsp.png   (I uploaded this image from my cache)
> 2011-04-13 14:04:25,398 - INFO - 6600:mapproxy.client.http.http:_log - wms.jpl.nasa.gov - - [13/Apr/2011:14:04:25 ] "GET /wms.cgi?request=GetMap&layers=us_ned&srs=EPSG:4326&width=300&height=300&format=image/png&styles=feet_short_int&bbox=-125.000000,7.333333,-82.333333,50.000000 HTTP/1.1" 200 58469 "-" ""
> 
> However, whenever I query mapproxy with the bbox aligned as I need it, the image returned is almost entirely white (destroying the heightmap values I need)
> 
> http://127.0.0.1:8080/service?SERVICE=WMS&REQUEST=GetMap&VERSION=1.3.0&WIDTH=256&HEIGHT=256&BBOX=20,-125,55,-60&CRS=EPSG:4326&FORMAT=image/png&LAYERS=us_ned&STYLES=&TRANSPARENT=FALSE
> http://img709.imageshack.us/img709/9559/service.png (This is the image returned by the above query)
> 127.0.0.1 - - [13/Apr/2011:15:21:51 -0500] "GET /service?SERVICE=WMS&REQUEST=GetMap&VERSION=1.3.0&WIDTH=256&HEIGHT=256&BBOX=20,-125,55,-60&CRS=EPSG:4326&FORMAT=image/png&LAYERS=us_ned&STYLES=&TRANSPARENT=FALSE HTTP/1.1" 200 8218 "-" "Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.16 (KHTML, like Gecko) Chrome/10.0.648.204 Safari/534.16"
> 
> It looks like mapproxy is attempting to recolor the image in some way - is there any way to disable that behavior?

Try to disable paletted images:

  globals:
    images:
      paletted: false

This is only configurable on a global level.


Regards,
Oliver

-- 
Oliver Tonnhofer    | Omniscale GmbH & Co KG    | http://omniscale.de
http://mapproxy.org | https://bitbucket.org/olt | @oltonn