* What went wrong:
Execution failed for task ':testen_RGBtoCMYK'.
> assert arr[0].toDouble() == 1.0 && arr[1].toDouble() == 0.0 && arr[2].toDouble() == 0.0 && Math.abs(arr[3].toDouble().round(5) - 0.64705) < 0.0001
         |  |   |          |      |                           |                           |
         |  NaN NaN        false  false                       false                       false
         [NaN, NaN, NaN, 1.0]