TroughModulate    279 magick/decorate.c   trough.red=QuantumScale*matte.red*TroughModulate;
TroughModulate    280 magick/decorate.c   trough.green=QuantumScale*matte.green*TroughModulate;
TroughModulate    281 magick/decorate.c   trough.blue=QuantumScale*matte.blue*TroughModulate;
TroughModulate   3150 magick/xwindow.c     pixel->matte_color.red*ScaleQuantumToShort(TroughModulate))/65535L);
TroughModulate   3152 magick/xwindow.c     pixel->matte_color.green*ScaleQuantumToShort(TroughModulate))/65535L);
TroughModulate   3154 magick/xwindow.c     pixel->matte_color.blue*ScaleQuantumToShort(TroughModulate))/65535L);