Sharpening to enhance detail is a critical process to finishing any image, especially when preparing images for print. As a photographer who specializes in creating large wall portraits of dogs, I routinely apply a strong degree of sharpening prior to printing. There is one specific technique that I use for sharpening that is especially effective when editing portraits of dogs and other furry subjects. Here is my best tip for enhancing detail in fur and hair while maintaining a soft appearance.
There are countless techniques to sharpen an image in Photoshop. When sharpening fur, an unwanted side effect that often occurs is the brightening of highlights, reducing the soft appearance of the fur. This effect is produced with virtually any global sharpening technique. For example, in this image of a spaniel I have applied a Smart Sharpen filter set to an Amount of 200% and Radius of 1.5 px. Notice the impact of the sharpening on the furry regions of the dog's face, especially around its nose. The highlights are much more pronounced, making the fur appear coarse.
Use the Darken Blend Mode
To prevent highlights in the fur from being brightened when sharpening is applied, I apply sharpening to a duplicated layer and set the blend mode to “Darken”. This step will enhance detail in the fur, without the unwanted consequence of brightening the highlights. You can see that the white fur around the dog’s nose looks much more natural when the Darken blend mode is utilized.
Before and after sharpening the image in on a duplicate layer, with the Blend Mode set to "Darken"
Understanding various methods of sharpening an image and when to apply each one is an important skill for any photographer to master. This particular technique is especially relevant to wildlife and pet photographers who shoot furry and hairy subjects on a routine basis.