  The steps taken to tailor to NIKA2 observations the Scanamorphos algorithm
(initially developed to subtract low-frequency noise from Herschel on-the-fly
observations) are described, focussing on the consequences of the different
instrument architecture and observation strategy. The method, making the most
extensive use of the redundancy built in the multi-scan coverage with large
arrays of a given region of the sky, is applicable to extended sources, while
the pipeline is so far optimized for compact sources. An example of application
is given. A related tool to build consistent broadband SEDs from 60 microns to
2 mm, combining Herschel and NIKA2 data, has also been developed. Its main task
is to process the data least affected by low-frequency noise and coverage
limitations (i.e. the Herschel data) through the same transfer function as the
NIKA2 data, simulating the same scan geometry and applying the same noise and
atmospheric signal as extracted from the 1 mm and 2 mm data.
