# Lut

std.Lut(vnode clip[, int[] planes, int[] lut, float[] lutf, func function, int bits, bint floatout])

  Applies a look-up table to the given clip. The lut can be specified as either an array of 2^bits_per_sample values or given as a function having an argument named x to be evaluated. Either lut, lutf or function must be used. The lut will be applied to the planes listed in planes and the other planes will simply be passed through unchanged. By default all planes are processed.

  If floatout is set then the output will be floating point instead, and either lutf needs to be set or function always needs to return floating point values.

  How to limit YUV range (by passing an array):

      luty = []
      for x in range(2**clip.format.bits_per_sample):
         luty.append(max(min(x, 235), 16))
      lutuv = []
      for x in range(2**clip.format.bits_per_sample):
         lutuv.append(max(min(x, 240), 16))
      ret = Lut(clip=clip, planes=0, lut=luty)
      limited_clip = Lut(clip=ret, planes=[1, 2], lut=lutuv)

  How to limit YUV range (using a function):

      def limity(x):
         return max(min(x, 235), 16)
      def limituv(x):
         return max(min(x, 240), 16)
      ret = Lut(clip=clip, planes=0, function=limity)
      limited_clip = Lut(clip=ret, planes=[1, 2], function=limituv)