Sharpening Photos in Photoshop with Unsharp Mask

Sharpening Photos in Photoshop with Unsharp Mask

Hello! Welcome to my tutorial on how to sharpen photos using a Photoshop filter called Unsharp Mask.

The Unsharp Mask filter, also known to some as USM, is currently the Holy Grail of digitally sharpening photos during post-production. Forget sharpening your photos in Photoshop solely with Sharpen, Sharpen Edges, Smart Sharpen, and Sharpen More. Unsharp Mask is the way to go. Almost all photos (with the exception of those artsy purposely blurry ones) will benefit from the use of this filter. Seriously. Many-a-photographer consider the Unsharp Mask filter a staple in their post-production process.

 

WHY DO I NEED UNSHARP MASK?

Many first-time photographers out there wonder why their photos don’t come out as sharp as they want when they upload them to their computers. Unlike photos manually processed with film and a dark room, the lines and colors in photos taken with a digital camera are limited to a grid of pixels.

For example, we have a black diagonal line on a white background. In order for our eyes to see a smooth diagonal line on screen, the color has to gradually change from from black and white so that the hard edges of the pixels will not be noticeable. Hence, when you zoom into it, you can see grays in between the two colors. These gray pixels are what cause an image to look blurry.

Even if you’ve managed to perfectly focus your photos, the image on screen and the photo you’ll print will be slightly blurrier than what you are actually taking. So, this means that you almost always have to go through the process of sharpening your photos in Photoshop.

 

THE HOLY GRAIL: UNSHARP MASK

Alright, Let’s get to it! Here’s our sample photo with only the levels and size edited.

Original, unsharpened image

The original, unsharpened image is slightly blurry. Soe of the details are lost in the photo

 

Tip: When working on your own photos, crop out unwanted parts of the image before adjusting and correcting anything else during post-production

Select the Unsharp Mask filter by going to FILTER > SHARPEN > UNSHARP MASK…

Tip: Zoom your photo at either 25%, 50%, or 100% when playing with the unsharp mask. Other zoom percentages have this weird anti-aliasing thing that doesn’t show the effects of Unsharp Mask accurately.

Now the sharpening magic begins! On the window, you’ll find 3 sliders: Amount, Radius, and Threshold. But first I’ll have to explain what each slider does, so you know what you’re doing.

AMOUNT is basically the strength of sharpening you want to apply to the image. When Photoshop sharpens images, it raises the contrast between light pixels and dark pixels–the light pixels get lighter and the dark pixels get darker. The higher you set the amount, the lighter the light pixels will be and the darker the dark pixels.

Raising the percentage too high can cause your photo to become very dotty and grainy.

 

 

and oversharpened image

Oversharpening your photos can cause halos (encircled in green) to appear on the edges

RADIUS is the area of the pixels that will be sharpened on either side of the edge. It’s ideal to keep the radius low (close to 1) so that you can achieve a sharp, yet natural look for the image. A larger radius can be used for higher resolution images.

A too large radius can cause halos around the edges. While some purposely do it for their works, it causes your photo to look less natural and oversharpened.

THRESHOLD allows you to set how much difference there needs to be inbetween colors in order to be sharpened. This means that the higher the threshold, the higher contrast between colors there needs for it to be sharpened. Honestly, most people usually leave this at 0.

Tip: Check the preview box so you can see the effects on your image as you move the sliders

 

 

APPLYING THE UNSHARP MASK FILTER

So now that you understand what the sliders mean, it’s time to apply what you’ve learned!

When do you apply the Unsharp Mask filter? Some photographers like to enlarge their photos, apply the Unsharp Mask then shrink it back to it’s original size. While others believe that the Unsharp Mask should be applied last, when the final image size is reached. I personally like sharpening my photos while they’re still large, then shrinking them down to their final size.

How do you apply it?

Unsharp Mask box

The sliders on the Unsharp Mask box allow you to adjust how Photoshop will sharpen your image

 

  1. Go to FILTER > SHARPEN > UNSHARP MASK…
  2. Set the Amount  to 100%, Radius to 1 (or 4 if you’re working on a higher resolution image), and Threshold to 0.
  3. Make sure the Preview box is checked.
  4. Move the radius slider up if you feel the image isn’t sharpened enough, and down if it’s over sharpened. As a rule of thumb, once you start to see halos forming around the edges in your picture, you should lower the radius.
  5. Adjust the Amount and Radius until you are satisfied.
  6. OPTIONAL: For images with a lot of noise, set the Threshold to at least 1 to reduce it.
  7. Press OK to apply the changes.

How much you sharpen your images all depends on personal preference. Some people like how striking the images appear after using Unsharp Mask, while others appreciate a more natural look. Try tinkering and playing around with the sliders until you get something you like!

For our example, I set the Amount to 137%, Radius to 0.5 pixels, and the Threshold to 0. Below, you can find a comparison of the picture quality before and after the Unsharp Mask filter is applied.

Comparison of the Unsharp Mask to the Original Picture

Notice how the details in leaves and the clothes in the photo comes out when the Unsharp Mask filter is applied.

Comparison between the photo before and after the unsharp mask filter is applied

The details of the horse's saddle, the womans dress, and the folds on the man's clothes pop out

Comparison between the original and the photo after the unsharp mask filter is applied

The folds on the leaves and cut of the flowers is more noticeable

 

FINAL PICTURE

The Final Result of applying the Unsharp Mask Filter

Tada! The Unsharp Mask Filter works its magic again!

And that brings us to the end of our tutorial on how to sharpen your photos in Photoshop with the Unsharp Mask filter. I hope this tutorial has helped you improve your final photos!

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