40 lines
1.4 KiB
Text
40 lines
1.4 KiB
Text
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Lut
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===
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.. function:: Lut(vnode clip[, int[] planes, int[] lut, float[] lutf, func function, int bits, bint floatout])
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:module: std
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Applies a look-up table to the given clip. The lut can be specified as either an array
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of 2^bits_per_sample values or given as a *function* having an argument named
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*x* to be evaluated. Either *lut*, *lutf* or *function* must be used. The lut will be
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applied to the planes listed in *planes* and the other planes will simply be
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passed through unchanged. By default all *planes* are processed.
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If *floatout* is set then the output will be floating point instead, and either
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*lutf* needs to be set or *function* always needs to return floating point
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values.
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How to limit YUV range (by passing an array):
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.. code-block:: python
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luty = []
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for x in range(2**clip.format.bits_per_sample):
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luty.append(max(min(x, 235), 16))
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lutuv = []
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for x in range(2**clip.format.bits_per_sample):
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lutuv.append(max(min(x, 240), 16))
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ret = Lut(clip=clip, planes=0, lut=luty)
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limited_clip = Lut(clip=ret, planes=[1, 2], lut=lutuv)
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How to limit YUV range (using a function):
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.. code-block:: python
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def limity(x):
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return max(min(x, 235), 16)
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def limituv(x):
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return max(min(x, 240), 16)
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ret = Lut(clip=clip, planes=0, function=limity)
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limited_clip = Lut(clip=ret, planes=[1, 2], function=limituv)
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