Hi David,

if you would like to specify the resolution of the request I suggest using WcsRequest instead of WmsRequest. WcsRequest allows you to specify the exact resolution of the image instead of image size. Otherwise your code seems to be correct.

m_wcs_request = WcsRequest(layer=‘FALSE_COLOR’,

                           custom_url_params={CustomUrlParam.EVALSCRIPT: all_bands_script},

                           bbox=mybox,

                           time=‘2017-07-18’,

                           resx='10m', resy='10m',

                           image_format=MimeType.TIFF_d32f,

                           instance_id=INSTANCE_ID)

You have probably already seen this but just in case I am adding a link to documentation with examples of such requests: http://sentinelhub-py.readthedocs.io/en/latest/examples/ogc_request.html#WCS-request