Function ncchannels_reverse 

pub fn ncchannels_reverse(channels: impl Into<NcChannels_u64>) -> NcChannels_u64

Returns the NcChannels_u64 with the fore- and background’s color information swapped, but without touching housekeeping bits.

Alpha is retained unless it would lead to an illegal state: HIGHCONTRAST, TRANSPARENT and BLEND are taken to OPAQUE unless the new value is RGB.

Method: NcChannels.reverse()