TroughModulate    235 magick/decorate.c   trough.red=(Quantum) (((double) matte.red*TroughModulate)/MaxRGB+0.5);
TroughModulate    236 magick/decorate.c   trough.green=(Quantum) (((double) matte.green*TroughModulate)/MaxRGB+0.5);
TroughModulate    237 magick/decorate.c   trough.blue=(Quantum) (((double) matte.blue*TroughModulate)/MaxRGB+0.5);
TroughModulate    238 magick/decorate.c   trough.opacity=(Quantum) (((double) matte.opacity*TroughModulate)/MaxRGB+0.5);
TroughModulate   3188 magick/xwindow.c     pixel->matte_color.red*ScaleQuantumToShort(TroughModulate))/65535L);
TroughModulate   3190 magick/xwindow.c     pixel->matte_color.green*ScaleQuantumToShort(TroughModulate))/65535L);
TroughModulate   3192 magick/xwindow.c     pixel->matte_color.blue*ScaleQuantumToShort(TroughModulate))/65535L);