SigmaUniform     2657 magick/accelerate-private.h OPENCL_DEFINE(SigmaUniform, (attenuate*0.015625f))
SigmaUniform     2821 magick/accelerate-private.h         noise=(pixel+QuantumRange*SigmaUniform*(alpha-0.5f));
SigmaUniform     1511 magick/gem.c         noise=(double) (pixel+QuantumRange*SigmaUniform*(alpha-0.5));