How To Denoise Something In Photoshop With Magic Wand

Lesson ix: Sharpening and Noise Reduction

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Introduction

Photoshop includes several tools y'all can use to correct your images. In this lesson, we'll prove you how to make the following corrections:

• Sharpening: If an image is less articulate than you'd like information technology to exist, you tin sharpen information technology.
• Noise reduction: If an image has a lot of dissonance, or graininess, you can reduce the paradigm dissonance.

Nosotros'll also cover the importance of using these tools correctly. If they are misused, sharpening and dissonance reduction tin can actually crusade problems. If they are used with care, they're a great fashion to add polish to your images.

If you'd like to follow forth, you can download some or all of our instance images. Only click any of the images below to open a full-sized version, then right-click the full-sized version and select Save Image Every bit to save information technology to your computer.

Sharpening

Sometimes an prototype may not exist every bit clear as you'd like it to be. Sharpening tin can help brand it look well-baked and clear by enhancing the edges of objects in the image. Nevertheless, adding as well much sharpness tin actually make an image look worse, or it can lead to a loss in image detail.

Every bit you can encounter, the right amount of sharpness makes the photo look crisp. For instance, in the heart epitome it's easy to run across the edges of the bird's feathers. Adding too much sharpness tin cause the edges to look exaggerated and unnatural (these are known as halos), as in the image on the right. Y'all may have too noticed that the background in the over-sharpened epitome has a lot of added image noise, or graininess.

Whenever you utilise sharpening, you'll need to look critically at the prototype to run across if y'all're getting the results you want. You'll oft demand to make careful adjustments to get the right amount of sharpening without introducing other issues like halos or noise.

Effort this!

Drag the slider in the interactive below to adapt the sharpness of the paradigm. Try to make the paradigm expect crisp merely not over-sharpened.

For all-time results, we recommend using the Chrome spider web browser with these interactives.

Unsharp mask

The unsharp mask filter is a common way to sharpen images in Photoshop. When you use this tool, you'll be able to control several settings, including:

• Amount: The amount determines how much sharpness volition be applied. The amount you'll demand depends on several factors, including the overall image size, so it's skilful to experiment with this setting.
• Radius: The radius controls the size of the details that volition be sharpened, so it'southward generally best to use a very low value for this setting. We recommend a radius betwixt 0.three and 0.5 for most images, although you may observe information technology useful to use a slightly larger radius (between 1 and 1.5) for higher-resolution images.
• Threshold: Sharpening tends to make image noise more visible. Increasing the threshold can assist to reduce this by telling the unsharp mask to ignore certain parts of the paradigm. Still, this can also mean that dissimilar parts of the prototype are not sharpened consistently. This is why nosotros recommend keeping this setting at 0 most of the time, unless the sharpening is creating a lot of extra noise.

To utilize an unsharp mask:

1. Right-click the layer you desire to sharpen, and so select Duplicate Layer. You lot'll apply the sharpening to this duplicate layer, which will preclude you from accidentally altering the original.

   

2. A dialog box will announced. Type a name for the new layer, and then click OK. In this example, we'll call it Sharpened.

   

3. With the new duplicate layer selected, go to Filter > Sharpen > Unsharp Mask. If you're using Photoshop Elements, you'll need to get to Enhance > Unsharp Mask.

   

4. A dialog box volition appear. Set the desired radius size, and so choose the amount of sharpness to add. Nosotros recommend experimenting with unlike amounts of sharpening to see what looks best. You can expect at the preview window above the sliders to encounter how sharpening is affecting the image.

   

5. Click the preview window to toggle the preview off and on. This is an easy fashion to compare the sharpened version with the original. To view a different part of the image, click and drag within the preview window. Note that yous'll also see the preview in the master document window.

   

6. Continue adjusting the settings until you're satisfied with outcome, then click OK. The unsharp mask will be applied.

Attempt this!

Open up the hawk_fullsize.jpg case file, duplicate the groundwork layer, and apply an unsharp mask. Suit the settings to find a residuum betwixt sharpness and a loss of particular.

To learn even more nigh sharpening, review this tutorial from Cambridge in Colour.

Sharpening tips

Here are a few tips for getting the all-time results with sharpening:

• If you increment the amount of sharpening that is added, there will mostly exist a indicate where the edges in the image will start to glow, causing them to wait exaggerated. Whenever yous see this happen, endeavour decreasing the corporeality to make the sharpening await more natural.
• If the sharpening still looks a bit unnatural, you could try reducing the opacity of the sharpened layer to make the event more subtle.
• Note that sharpening cannot fix an image that'south very blurry or out of focus. Information technology works best with images that are articulate merely have a slightly soft look.
• While the unsharp mask is a useful tool, Photoshop also includes other sharpening filters, which can be found in the Filter > Sharpen menu. Some filters, like Sharpen and Sharpen More, utilize a preset amount of sharpening. Others, similar Smart Sharpen, give you even more ways to tweak the adjustments (although this also means it's fifty-fifty trickier to use than the unsharp mask).

To larn more than about using Smart Sharpen, review this video from Adobe.

Racket reduction

Some images may have a lot of noise, which causes them to look grainy. You can compensate for this by reducing the image noise, every bit in the instance below.

Understanding racket reduction

When you apply noise reduction, you're really removing information from the image. Because of this, it'due south important to employ this characteristic advisedly to avoid removing too much noise, which can cause blurriness and a loss of detail. The goal of dissonance reduction is not to completely remove all noise from the image; instead, yous're merely trying to make the image look cleaner and clearer.

As with sharpening, y'all should always expect critically at the image to run across if you lot're getting the results you want. Losing a small corporeality of item may exist unavoidable when reducing noise, and then you'll need to brand careful adjustments to observe the right balance. It's often better to remove less noise in club to preserve as much detail as possible.

When using this tool, you'll be able to control several settings, including:

• Strength: This setting controls the overall level of noise reduction that will exist applied. We recommend starting with this setting at the maximum value (x) considering it will brand it easier to run into the effect the other settings accept. After you've adjusted the other settings, you can decrease the force as needed to get the desired amount of noise reduction.
• Preserve Details: This determines how many details from the original image will be preserved. If you lot use a value that's as well low, the epitome volition lose a lot of detail. However, anything too loftier volition cancel out the effects of noise reduction. Y'all'll want to experiment with this setting until yous're satisfied with the outcome.
• Reduce Color Noise: Sometimes dissonance will look similar minor patches of individual colors, which is known as color dissonance. Increasing the Reduce Colour Noise setting volition help to reduce this. Still, taking this setting too high can cause the different colors in your image to drain together, so we recommend using a relatively low value for nigh images.
• Sharpen Details: Reducing image noise too causes the paradigm to lose some sharpness. This setting allows you lot to add sharpness back to the details of the epitome. Nevertheless, just like with Preserve Details, this can cancel out the effects of noise reduction, so exist conscientious not to set it likewise high.

Try this!

Drag the slider in the interactive below to suit the level of noise reduction. Think, removing too much noise will cause the prototype to lose detail. Endeavour to detect a level that makes the paradigm wait make clean without losing too much item.

To apply noise reduction:

1. Right-click the desired layer, then select Duplicate Layer. You'll apply the noise reduction to this duplicate layer, which volition prevent you from accidentally altering the original.
2. A dialog box will appear. Blazon a proper name for the duplicate layer, and then click OK. In this example, we'll phone call it Noise Reduction.
3. With the new duplicate layer selected, go to Filter > Noise > Reduce Racket.

   

4. A dialog box will appear. Take some time to accommodate each setting, post-obit the guidelines above. You lot can look at the preview window to the left of the sliders to come across the effect.

   

5. Click the preview window to toggle the preview off and on. This is an easy way to compare the noise reduction with the original. To view a different office of the image, click and drag inside the preview window. Note that you'll besides see the preview in the master certificate window.
6. Go along to adjust the settings until y'all're satisfied with the results, then click OK. The noise reduction will be applied.

Try this!

Open the globe_building_fullsize.jpg example file, duplicate the groundwork layer, and utilise noise reduction. Arrange the settings to find a balance between noise reduction and a loss of particular.

Claiming!

If yous desire to do making the adjustments we cover in this lesson, you lot can download some or all of our example images. Just click whatever of the images beneath to open a total-sized version, then right-click the full-sized version and select Save Paradigm As to salve it to your computer.

1. Open up the flower_fullsize.jpg example file in Photoshop.
2. Duplicate the groundwork layer, then utilize an unsharp mask. Take some time to adjust the different settings, comparing the sharpened version with the original.
3. Open the ferris_wheel_fullsize.jpg example file.
4. Duplicate the background layer, and then use noise reduction. Take some time to adjust the different settings, comparing the noise reduction with the original.
5. When you're finished editing, apply the Relieve for Web feature to export the images every bit JPEGs.

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Source: https://edu.gcfglobal.org/en/photoshopbasics/sharpening-and-noise-reduction/1/

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