The colors of a gradient, see Image.linearGradient
The colors along the gradient: their positions (0..1) and colors, like Colors.gradient takes them ({ 0: 0xff0000ff, 0.5: 0xffff00ff, 1: 0x00ff00ff }), or just the colors, evenly spaced ([0xff0000ff, 0x00ff00ff])
{ 0: 0xff0000ff, 0.5: 0xffff00ff, 1: 0x00ff00ff }
[0xff0000ff, 0x00ff00ff]
The colors of a gradient, see Image.linearGradient