def desaturate(self):
alpha = self.img.split()[<NUM_LIT:3>]<EOL>self.img = self.img.convert("<STR_LIT:L>")<EOL>self.img = self.img.convert("<STR_LIT>")<EOL>self.img.putalpha(alpha)<EOL>
Desaturates the layer, making it grayscale.

        Instantly removes all color information from the layer,
        while maintaing its alpha channel.