Warning: This function is
currently not documented; only the argument list is
available.
Warning: This function is
EXPERIMENTAL. The behaviour of this function, the
name of this function, and anything else documented about this
function may change without notice in a future release of PHP.
Use this function at your own risk.
Returns the normalized HSL color described by the ImagickPixel object,
with each of the three values as floating point numbers between 0.0
and 1.0.
Return Values
Returns the HSL value in an array with the keys "hue",
"saturation", and "luminosity". Throws ImagickPixelException on failure.