Home » Tip of The Day » Sharpen Images After You DownsampleSharpen 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: » Sign-up for the PTC Newsletter so that you'll never miss a tutorial!. Your Email Address: