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In hierarchical galaxy formation models, galaxies evolve through mergers andaccretions. Tidally-disrupted debris from these processes can remain asdiffuse, faint structures, which can provide useful insight into the assemblyhistory of galaxies. To investigate the properties of the faint structures inoutskirts of nearby galaxies, we conduct deep and wide-field imaging surveywith KMTNet. We present our observing strategy and optimal data reductionprocess to recover the faint extended features in the imaging data of NGC 1291taken with KMTNet. Through the dark sky flat-fielding and optimal skysubtraction, we can effectively remove inhomogeneous patterns. In the combinedimages, the peak-to-peak global sky gradients were reduced to less than$\sim0.5$% and $\sim0.3$% of the original $B$- and $R$-band sky levels,respectively. However, we find local spatial fluctuations in the background skywhich can affect the precise measurement of the sky value. Consequently, we canreach the surface brightness of $\mu_{B,1\sigma} \sim$ 29.5 and$\mu_{R,1\sigma}\sim$ 28.5 mag arcsec$^{-2}$ in azimuthally averagedone-dimensional surface brightness profiles, that is mainly limited by theuncertainty in the sky determination. These results suggest that the deepimaging data produced by KMTNet are suitable to study the faint features ofnearby galaxies such as outer disks and dwarf companions, but unideal (notimpossible) to detect stellar halos. The one-dimensional profile revealed thatNGC 1291 appeared to have Type I disk out to $R$ $\sim$ 30 kpc with no obviouscolor gradient and excess light due to a stellar halo was undetected.

KMTNet Nearby Galaxy Survey I. : Optimal strategy for low surface brightness imaging with KMTNet