PICASSA: Intrinsic Functions
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| [-1, 1, -1] | y | x | !x |
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| x + y | x - y | x * y | x / y |
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| ceil(x) | floor(x) | abs(x) | log(x) |
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| sin(x) | atan(x) | cos(x) | exp(x) |
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| yCrCbToRGB(x) | RGBToYCrCb(x) | perlinBW(x, y) | perlinColor(x, y) |
