grayscale static method
Implementation
static List<double> grayscale() {
const double lumR = 0.2126;
const double lumG = 0.7152;
const double lumB = 0.0722;
return [
lumR,
lumG,
lumB,
0,
0,
lumR,
lumG,
lumB,
0,
0,
lumR,
lumG,
lumB,
0,
0,
0,
0,
0,
1,
0
];
}