Sharpen Images After You Downsample January 14, 2017. Posted in: Tip Of The Day. After downsampling (scaling down) an image, it tends blur and lose detail. To bring some sharpness back, use the Unsharp Mask filter (Filter > Sharpen > Unsharp Mask). « 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.