Probably Channel Masking is one of the most time-worthy masking because it contains huge manual labor by using Photoshop. It’s not heavy lifting work but remember one thing you have to work with so many tools and as well as command of Photoshop.
For channel masking firstly go to the channels palette then select the channel which you want ctrl-click (Ctrl-Click on a Mac), to copy the channel. After that back to your layer which you selected and add a mask or create a blank, white mask on your layer. And make sure the mask is selected then go to Image > Apply Image select the channel you want from the channel dropdown and click ok.