grayscale method

ContainerBuilder grayscale([
  1. double amount = 1.0
])

Implementation

ContainerBuilder grayscale([double amount = 1.0]) => colorFilter(ColorFilter.matrix([
  0.2126 + 0.7874 * (1 - amount), 0.7152 - 0.7152 * (1 - amount), 0.0722 - 0.0722 * (1 - amount), 0, 0,
  0.2126 - 0.2126 * (1 - amount), 0.7152 + 0.2848 * (1 - amount), 0.0722 - 0.0722 * (1 - amount), 0, 0,
  0.2126 - 0.2126 * (1 - amount), 0.7152 - 0.7152 * (1 - amount), 0.0722 + 0.9278 * (1 - amount), 0, 0,
  0, 0, 0, 1, 0,
]));