Comparison of forward diffusion schedules in BGRem (left, this work) and the original DDPM scheme (right; Ho et al. 2020). BGRem demonstrates supervised additive corruption of the image with scaled background noise σ_tx, following the noise scheduling of σ_t described in Eq. (3). The bars represent relative contribution of photon counts from the source fraction (hatched blue) and the noise fraction (yellow) for a given time step, as obtained from a random image.