contrast static method

List<double> contrast(double value)

Implementation

static List<double> contrast(double value) {
  double adj = value * 255;
  double factor = (259 * (adj + 255)) / (255 * (259 - adj));
  double offset = 128 * (1 - factor);
  return [
    factor,
    0,
    0,
    0,
    offset,
    0,
    factor,
    0,
    0,
    offset,
    0,
    0,
    factor,
    0,
    offset,
    0,
    0,
    0,
    1,
    0
  ];
}