The next step in this introduction is to include more than one channel to 'Invert', this is done by choosing one Channel, say 'b', then shift-clicking on, for this example, 'Lightness' Channel.

The effect will not be to everyone's taste but you can begin to understand how valuable access to individual channels can be.

If you wish to experiment with reduced intensities of 'Invert', go to Edit > Fade Invert (see below) and adjust the slider control. :

Also, as an option in the Fade' dialogue box, different 'Blend Modes' can be tried - see below

NB 'Edit > Fade' is only available immediately after making the Invert command.