Gebbi

def lineart_rpow2 (src, w=1280, h=720, ow=1920, oh=1080, bicubic=False, b=1/3, c=1/3, cm_b=1/3, cm_c=1/3):
    core = vs.get_core()
    if src.format.bits_per_sample < 16:
        src_16 = core.fmtc.bitdepth(src, bits=16)
    else:
        src_16 = src
    src_16_y = core.std.ShufflePlanes(src_16, planes=0, colorfamily=vs.GRAY)
    if bicubic:
        sharp = core.fmtc.resample(src_16_y, w, h, kernel='bicubic', a1=b, a2=c, invks=True)
        creditmask = core.fmtc.resample(DebicubicM(src_16, w, h, b=cm_b, c=cm_c, showmask=1), ow, oh, kernel='bicubic')