greyscale top-level constant
ColorFilter
const greyscale
Implementation
const ColorFilter greyscale = ColorFilter.matrix(<double>[
0.333,
0.333,
0.333,
0,
0,
0.333,
0.333,
0.333,
0,
0,
0.333,
0.333,
0.333,
0,
0,
0,
0,
0,
1,
0,
]);