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In this paper, we demonstrate a new method for fitting galaxy profiles whichmakes use of the full multi-wavelength data provided by modern largeoptical-near-infrared imaging surveys. We present a new version of GALAPAGOS,which utilises a recently-developed multi-wavelength version of GALFIT, andenables the automated measurement of wavelength dependent S\'ersic profileparameters for very large samples of galaxies. Our new technique is extensivelytested to assess the reliability of both pieces of software, GALFIT andGALAPAGOS on both real ugrizY JHK imaging data from the GAMA survey andsimulated data made to the same specifications. We find that fitting galaxylight profiles with multi-wavelength data increases the stability and accuracyof the measured parameters, and hence produces more complete and meaningfulmulti-wavelength photometry than has been available previously. The improvementis particularly significant for magnitudes in low S/N bands and for structuralparameters like half-light radius re and S\'ersic index n for which a prior isused by constraining these parameters to a polynomial as a function ofwavelength. This allows the fitting routines to push the magnitude of galaxiesfor which sensible values can be derived to fainter limits. The techniqueutilises a smooth transition of galaxy parameters with wavelength, creatingmore physically meaningful transitions than single-band fitting and allowsaccurate interpolation between passbands, perfect for derivation of rest-framevalues.

MegaMorph - multi-wavelength measurement of galaxy structure: complete S\'ersic profile information from modern surveys