GenerateDifferentialNoise  311 magick/gem.c     value=(double) pixel+GenerateDifferentialNoise(pixel,noise_type,
GenerateDifferentialNoise   25 magick/gem.h     GenerateDifferentialNoise(const Quantum pixel,const NoiseType noise_type,
GenerateDifferentialNoise 1297 magick/operator.c     factor*GenerateDifferentialNoise((double) quantum,noise_type,kernel);