+ // Since all the quarters are > 0.5, avg is between 0.5 and 1.0
+ // So, expand the range of the value
+ avg = (avg - 0.5f) * 2;
+
+ // Do not use the " " char, as it would make a
+ // "all quarters > 0.5" pixel go black
+ return getDitheringChar(avg, "░▒▓█");