TroughModulate    275 magick/decorate.c   trough.red=QuantumScale*matte.red*TroughModulate;
TroughModulate    276 magick/decorate.c   trough.green=QuantumScale*matte.green*TroughModulate;
TroughModulate    277 magick/decorate.c   trough.blue=QuantumScale*matte.blue*TroughModulate;
TroughModulate   3109 magick/xwindow.c     pixel->matte_color.red*ScaleQuantumToShort(TroughModulate))/65535L);
TroughModulate   3111 magick/xwindow.c     pixel->matte_color.green*ScaleQuantumToShort(TroughModulate))/65535L);
TroughModulate   3113 magick/xwindow.c     pixel->matte_color.blue*ScaleQuantumToShort(TroughModulate))/65535L);