● Adjust the Radius slider to determine the number of pixels neighboring the edge pixels that will affect the sharpening. The greater the radius, the wider the effect and the more obvious the sharpening.
● Use the Threshold setting to indicate how different the sharpened pixels must be from their surrounding pixels before they are considered edge pixels. If they are considered edge pixels, they’ll be adjusted by the sharpening filter. Adjust the Threshold to get different experimental results and see what works best for your image.
3. Prevent colour shifting.
The Unsharp Mask affects the colour of pixels as well as the brightness. In areas of fine detail and complex colour textures, the sharpening can increase some colour values while decreasing others. To prevent this colour shifting, change the blend mode of the Unsharp Mask.
To change the blend mode of the Smart Object filter, double-click the Blending Options icon to the right of the filter’s name. Then in the Blending Options dialogue box, change the blend mode of the filter from Normal to Luminosity. This should preserve the colour values of your original image.
More ways to sharpen in Adobe Photoshop.
The Unsharp Mask is a very effective filter for creating striking, high-contrast images. If you want to use a more subtle sharpening effect, there are more tools to explore in Photoshop.
Try Smart Sharpen.
If you want to achieve a specific look with your sharpening, use the Smart Sharpen effect. “You have more control of how the sharpening is applied to the image if you use Smart Sharpen,” says Ramirez. With this tool you can set the sharpening algorithm and control how it affects the light and dark areas of your photo. This lets you subtly reduce noise, remove Gaussian Blur and more.