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[submitted] FTbg: Background removal using Fourier Transform

FTbg is a handy Python script which takes a FITS image, perform Fourier transform, and separate low- and high-spatial frequency components by a user-specified cut. Both components are then inverse Fourier transformed back to image domain. It can be used to remove large-scale background/foreground emission in many astrophysical applications. FTbg has been designed to identify and remove Galactic background emission in Herschel/Hi-GAL continuum images, but it is applicable to any other (e.g., Planck) images when background/foreground emission is a concern.

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