Adding Blur and Sharpness To Channels When Creating Selections September 21, 2015. Posted in: Tip Of The Day. When using channels to create selections, consider adding the Gaussian Blur filter to soften the edges. You can also apply the a Unsharp Mask filter to reduce the softness of edges. « Previous Photoshop Tip: | Next Photoshop Tip: » Get The Tip of The Day in Your Inbox! Sign-up for the PTC Newsletter to receive a weekly re-cap of the Tips of The Day. That way you'll never miss a tip. You'll also get instant access to the Subscriber Only Tutorials! Enter your email below to sign up! Your Email Address: You Can Also Get Daily Tips On Your Feed! Every Photoshop Tip of The Day is posted in our Facebook & Google Plus, Twitter, LinkedIn, and Pinterest pages.