int rVal = 255;
int gVal = 255;
int bVal = 255;
int bgVal = 0;
int bgR = bgVal*13/10;  // Red value
int bgG = bgVal*5/10;   // Green value
int bgB = bgVal*4/10;   // Blue value

final float stimulusColor = 180;  //stimulus intensity out of 255
final float greenscale = 0.3; // scales down intensity of green
final float redscale = 0.7; // scales down intensity of red