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35 lines
826 B
Python
35 lines
826 B
Python
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import numpy as np
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class DitherPattern:
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PATTERN = None
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ORIGIN = None
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class FloydSteinbergDither(DitherPattern):
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# 0 * 7
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# 3 5 1
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PATTERN = np.array(((0, 0, 7), (3, 5, 1)),
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dtype=np.float32).reshape(2, 3, 1) / np.float(16)
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# XXX X_ORIGIN since ORIGIN[0] == 0
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ORIGIN = (0, 1)
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class BuckelsDither(DitherPattern):
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# 0 * 2 1
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# 1 2 1 0
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# 0 1 0 0
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PATTERN = np.array(((0, 0, 2, 1), (1, 2, 1, 0), (0, 1, 0, 0)),
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dtype=np.float32).reshape(3, 4, 1) / np.float32(8)
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ORIGIN = (0, 1)
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class JarvisDither(DitherPattern):
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# 0 0 X 7 5
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# 3 5 7 5 3
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# 1 3 5 3 1
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PATTERN = np.array(((0, 0, 0, 7, 5), (3, 5, 7, 5, 3), (1, 3, 5, 3, 1)),
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dtype=np.float32).reshape(3, 5, 1) / np.float32(48)
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ORIGIN = (0, 2)
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