Basing the renders on concepts, via layers using passes (e.g. diffuse, ambient occlusion, reflection, subsurface scattering, etc.), I export my scenes’ pixel information using 32 bit exr format. This dynamic range resolution allows me to composite the scenes in a photo-realistic fashion and apply nodes and filters by rendering vector passes, e.g. motion blur or depth of field, in a fraction of the time compared to rendering directly on each frame.