Proposal: love.graphics.alpha()

[Inny]

The love blend modes are pretty powerful, and you may want to experiment with them more.

This is a really handy tool for testing openGL blend modes: http://www.andersriggelsen.dk/glblendfunc.php
The Love blend modes are coded here: bitbucket link

Just as a side note, what you want can probably be accomplished by drawing front-to-back using the subtractive blend mode.