How to deal with noise in Photoshop

??Hello. Today you will learn how to edit a photo spoiled by a high “noise” content, reducing it to a minimum. But in order to avoid such an effect initially, you need to remember the ideal ratio of “exposure”, or an exposure triangle (aperture, shutter speed and ISO parameter). It can be found in this article.

The surest way to remove noise is to use the main filter in this case, Reduce Noise. But the author uses and Surface Blur (Blur on the surface), as another way to eliminate noise and grain. Let’s see what in the end we will give such a duet of the above filters.

The original image (top), and the final (bottom). In the corner are enlarged fragments for better comparison.

The effect is excellent, isn’t it? Then we proceed to the method described by the author of the lesson.

Step 1

Select a photo to process. Open it in Adobe Photoshop and duplicate the source layer. Open the filter Filter – Noise – Reduce Noise (Filter – Noise – Reduce noise). This filter is intended solely to eliminate color noise in photographs taken in low light conditions.

The author used the following settings for the filter Reduce noise (Reduce noise):

Let us consider in detail the successive influence of each parameter on the photo.

Strength (Intensity) – the main parameter to reduce noise brightness. Result after changing the parameter.

Preserve details (Save Details) – determines the value of the strength of the previous parameter. Result after changing the parameter.

Reduce Color Noise (Reduce color noises) – changes the power of chromatic noise, otherwise removes the color pixels that appear in JPEG images. On the left is an image with a 5% reduction in color noise, on the right is 90% (the desired result). Result after changing the parameter.

Sharpen details (Sharpness Details) – Keeps the sharpness of the contours of the image to focus on some of the details. On the left, the parameter is set to 74%, to the right to 0%. Result after changing the parameter.

Depending on your image, adjust the above parameters in your own way. Basically, we only need Strength (Intensity) and Reduce Color Noise (Reduce the color noises), other parameters can be reduced to zero.

And the last parameter Remove JPEG Artefact (Remove JPEG Artifact) – used to reduce artifacts, when compressed, after saving the image, in JPEG format. In this lesson, the author did not apply, because a high resolution image was used.

The original (top) and edited (bottom) image.

Step 2

Duplicate the edited layer. Select filter Filter – Blur – Surface Blur (Filter – Blur – Blur on the surface). This filter will help remove all the flaws that the previous filter left us. Reduce noise (Reduce noise). Surface blur blurs the area with a uniform tone, while small details are either not blurred or blurred slightly. There are two options for Surface Blur:

Radius (Radius) – the size of the blurred area. Threshold (Isohelium) – blurring of the adjacent pixels with the main blurred area. With these parameters, you also need to be careful, and customized for each image individually.

The result of applying the Surface Blur filter (bottom).

Step 3

Merge two duplicated, edited, with the help of previous filters layer in one group. Change Opacity group by 65%.

The original image (top) when zoomed, and the final, with the use of two filters and reduce the opacity, the image (bottom).

Thus, the imposition of two different in the sense, but developed for the same purpose filters, we have achieved the desired result.

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