As a general rule, the word “noise” is most often used to describe a sound that is often loud and causes irritation or other negative reactions. But sometimes noise means not only sound distortion that interferes with the transmission of a signal or information.
In the field of photography, noise refers to graininess and false colors in an image, which often results in loss of detail and color distortion.
Noise is the same electronic interference that you see on the TV screen, hear on the radio or during telephone conversation. In cameras, such noise appears to be something like grains of sand, which themselves increase in size, color variations and become more and more erratic as the noise increases. In most cases, good cameras are capable of attenuating noise quite satisfactorily, and cameras with full-frame sensors do this best.
Noise in photographs increases as the ISO value increases, or as the shutter speed is slowed down, because then the so-called signal-to-noise ratio increases. Trying to get more photo information, we amplify the signal, but this inevitably leads to transmission errors (respectively, to the appearance of noise).
This image clearly illustrates the appearance of speckles and grains of false colors, the presence of this kind of noise is common when using large values.ISO, i.e. when we try to make the image lighter and brighter. ISO 3200 on EOS 1D Mark IV.
The ability of a camera to reduce noise covers several different aspects: the size of the light sensor, technology, digital processor, software, and the contribution of the photographer himself (camera settings, etc.). To initially create photos with a minimum amount of noise, you need to familiarize yourself with all the factors that affect their appearance.
Noise reduction
The noise reduction function, roughly speaking, cleans up the signal received by the camera. Noise reduction algorithms try to eliminate different kinds interference, which in photographs are expressed as noise.
Even after a slight reduction in noise, there is a noticeable improvement general view Pictures. False colors have been removed, grain has become more uniform, and detail has been increased.
Shot of the ring using daylight and a low power LED to add sparkle. Camera settings: 1/100sec, f/8.0, ISO 3200, 100mm macro. In a programmeLightroom has applied noise reduction.
It is impossible to get rid of noise completely, because the signal cannot be perfectly clean. Noise suppression is not equivalent to its complete elimination. Also, excessive use of the noise reduction function may result in loss of image quality. Therefore, without fanaticism, always select the most optimal values that do not affect the quality of the photo.
With excessive noise reduction, both detail and image sharpness are lost.
As with the camera, noise reduction during post-processing is essentially a balancing act between the original capabilities of the camera, the capabilities of the used software and user settings.
Noise reduction in Lightroom
In the Develop module in Adobe Photoshop Lightroom, you will find a section called Detail, which contains the Sharpening and Noise Reduction tools we need. Tool Noise Reduction is divided into two subsections: Luminance (Brightness) and Color (Color). Each category has its own set of adjustment sliders.
The Luminance slider is responsible for the graininess, and the Color slider for the color of the noise. Accordingly, the first slider will soften the graininess, while the second one will work with elements whose color is out of the picture. As the program demarcates the areas of noise reduction, you can understand what type of noise prevails in your photo.
Noise Reduction Luminance
In the first section of the Noise Reduction tool are sliders related to Luminance (Brightness): Luminance, Detail and Contrast. They control three aspects of luminance noise.
The effect is most noticeable when moving the first Luminance slider, the other two sliders make more subtle changes.
- The Luminance slider focuses on the graininess of the noise. As the effect increases, the grains will coalesce more and more. If you move the slider too far, then details such as hair and fabric texture will simply disappear.
- The next slider Detail (Detail) adjusts the threshold of the effect that creates a change in Luminance. That is, it helps to restore some of the details that were lost after using the Luminance slider.
- And finally, the slider Contrast (Contrast) affects the contrast of each individual “grain”. It works similarly to the standard contrast tool, but on a smaller scale. Its effect is subtle, even at 100.
Noise Reduction Color
The effect is most noticeable when moving the first slider.Color, the other two sliders make more subtle changes.
- The Color slider affects the “color ripples” in your photo, bringing the pixels to a uniform color. But if you move the slider too far, then all similar colors will blend and smooth out.
- The Detail slider works similarly to the slider of the same name in the Luminance section and adjusts the threshold of the effect being created.
- The Smoothness slider determines how smooth the transition between the corrected colors will be. It is similar to the Contrast slider. Its effect is also barely perceptible.
Other Noise Reduction Tools
Sometimes there is a need to apply the noise reduction function selectively, i.e. not to all parts of the image. Three tools in LightRoom allow you to do this: Radial Filter, Gradient Filter, and Adjustment Brush. Each of these tools has a slider that allows you to adjust the noise only in the areas to which the tool has been applied.
Selective application of noise reduction is especially useful in cases where a global change would result in a loss of image quality, or when you want more control over how the effect is applied. For example, with increasing brightness, shadows tend to make more noise than bright areas. You can apply one of these tools to reduce noise in the shadow areas of your photo.
Sharpening and Noise Reduction
An outdated camera, use of very high ISO settings, and other factors can result in intense noise that needs to be suppressed. However, in many cases, strong noise reduction leads to an unpleasant consequence, namely the loss of detail and blurring. To prevent this effect, you can use the Sharpening tool.
Even with a seemingly insignificant shift of the Sharpening slider, very significant changes occur. However, using this tool can bring back the noise we worked so hard to get rid of. In this case, there is a little trick, namely the Masking slider, which helps restore sharpness without affecting our work on noise reduction. A value of 0 applies the effect to the entire photo. Increasing the value spreads the effect over a smaller area, namely the edges with high contrast.
Holding down a keyAlt as you move the slider, you can see where the effect is applied. White areas are the area of application. This feature is useful in cases where main goal is noise reduction, but it is necessary to keep the edges sharp.
We have illustrated the difference between photos with different metricsmasking. The first photo was set to 80% and the second to 20%.
The big advantage of using the Sharpening mask in conjunction with the Noise Reduction tool is that it allows you to set high Noise Reduction values, but still leave sharp edges. This setting is suitable for processing skin, walls, sky and other flat surfaces.
Noise reduction presets
The final task of this tutorial is to create presets in Lightroom, taking into account the cameras used and the ISO values for further reuse. In general, presets are the key to significant time savings. I will give an example from personal experience. The noise that appears in photos taken with my Canon EOS 1D Mark IV at ISO 3200 and above becomes quite noticeable, so I created presets for specific settings.
Depending on the parameters set on your camera and its characteristics, you can also apply additional manipulations to presets, such as Hue-Saturation (Hue / Saturation), Luminance (Brightness), etc.
The circled preset I created to edit photos that I shoot in a specific place where I most often useISO 3200. Over time, I added custom white balance settings to this preset. Now in one click I can edit (get rid of noise and correct white balance) all photos taken in these conditions.
Conclusion
And although the work on noise begins already directly during shooting (low ISO values, correct exposure), it is nevertheless important to be able to get rid of noise during post-processing. Your camera will do its best, and Lightroom will improve the result. Applying the right noise reduction technique will allow you to publish and print photos in a larger format. Using presets will significantly save your time spent on post-processing.
How to remove noise from a photo so as to preserve small details and leave maximum sharpness frame? The question is quite complex and very common. That is why many noise reduction tools have been developed in various programs and plug-ins.
The ideal solution to the problem of noise is to prevent its occurrence during the shooting process:
- set the correct ;
- if possible, take pictures in RAW format;
- compose the frame so that it is not cut off much during processing.
But if during the shooting all the conditions were met, but there is still noise ...
How to remove noise from a photo:
How to remove noise in Adobe Photoshop:
Before the direct removal of noise, on responsible shots, in each channel, for more subtle elimination. This allows you to save more details in the image and achieve a better result.
Reduce Noise Filter
In order to remove noise from photos in Photoshop, there is a special filter Filter – Noise – Reduce Noise (Filter – Noise – Remove Noise).
The dialog box presents two filter modes:
Basic - Set the parameters to remove noise from all channels in the same way.
Advanced (Advanced) - it becomes possible to configure the parameters for removing noise in each channel individually (Per Channel (Per Channel)) and a setting similar to the Basic mode - (Overall (Above all)) (Fig. 1.).
Rice. 1 - Reduce Noise Dialog Box Parameter Strength (Intensity) adjusts the degree of reduction of brightness (tone) noise in all channels.
The Preserve Details option allows you to save some image detail. But the larger the value of the parameter, the less noise is removed. The value of the parameter is determined empirically, depending on the original image and the Strength parameter.
The Reduce Color Noise option allows you to reduce the amount of chromatic noise.
Parameter Sharpen Details (Sharpness of details) allows to strengthen image sharpness.
The Remove JPEG Artifact checkbox masks the square fragments of an image that occur during JPEG compression.
Rice. 2 - An example of the action of the Reduce Noise filter To enhance the effect, the filter can be applied several times. Short command Ctrl + F.
Adobe Camera RAW plugin
Adobe Camera RAW- a plug-in that allows you to process graphic files before opening them directly in Adobe Photoshop. It was developed specifically for the RAW format, in which most professional digital cameras save photos.
If the source file is not in RAW format, but for example, JPEG, then Photoshop has a function that will allow you to open the image in Adobe Camera RAW File - Open As (File - Open As) - select Camera RAW - select file - Open (Fig. 3 ).
Rice. 3 - How to open a file in Camera RAW In order to remove noise from the photo, you need to go to the Detail tab (Fig. 4). In the Noise Reduction graph, you need to raise Luminance to a level where the noise starts to disappear and lower it to the minimum Luminance Detail, followed by a rise to bring out fine details. Similarly with Color , color detail.
The Luminance parameter adjusts the level of luminance noise reduction.
The Luminance Detail parameter adjusts the noise reduction threshold. A small value gives a cleaner result, but details disappear with noise.
The Luminance Contrast parameter adjusts the luminance contrast on the edge between light and dark areas. Smaller values give better noise reduction results, but at the same time less contrast, a blurrier image.
The Color parameter controls the level of chromatic noise reduction.
The Color Detail parameter adjusts the chromatic noise reduction threshold.
Rice. 4 - Detail tab. Camera RAW Plugin Example It is also possible to remove noise in Photoshop Lightroom, it has an intuitive interface, which is built by analogy with the Adobe Camera RAW plugin.
As you can see from the examples above, the Adobe Camera RAW plugin does a better job of reducing digital noise than the Reduce Noise filter. Also among the advantages of Camera RAW:
- carrying out non-destructive image processing;
- synchronization of settings among images taken in the same conditions to increase processing productivity;
- performance (Photoshop not loaded yet);
- intuitive interface.
Noise Reduction Plugins
To suppress noise, in addition to Adobe Photoshop, other programs and plug-ins are also used (most often RAW converters). They are both paid and free.
Plugins for Photoshop: Adobe Camera RAW, Topaz DeNoise, Neat Image, Grain Surgery, Noise Ninja.
RAW converters(individual programs): Adobe Lightroom, Capture One, Bibble (Corel), Apple Aperture (Mac OS X only).
In the first part of this lesson, we analyzed the causes of noise in photography, its components, and what to do in order not to provoke their appearance. In this tutorial we will learn how to reduce noise in Photoshop, Capture One, Digital Photo Professional And Lightroom. All of these programs have a tool for reducing noise in photography, called in the jargon of photographers " noise reduction».
- On this stage you need to understand that:
- If during the shooting there are only two alternatives: to take a picture without noise (low sensitivity of the camera matrix) but not sharp, or with noise, but sharp, then I choose the second option. For you can’t get rid of blurriness, but you can still fight against noise.
- It is not always necessary to completely remove noise in a photo, often it is enough to reduce its level to an acceptable level.
- Luma and chromatic noise are removed differently.
- At 100% image scale on the monitor, we see noise several times larger in area than they will be on a print, in a printing publication or an online photo album.
In this lesson there are big pictures, which are automatically scaled if your screen size is smaller than necessary. When this happens, a 100% zoom button will appear in the top right corner of the photo. Only this scale will allow you to accurately assess the strength and size of the noise. To view those parts of the illustration that are hidden, drag the image with the mouse by its central part. To close the photo and return to the article, press the Esc key.
Initial conditions: all noise reduction is disabled in my camera, shooting is carried out in RAW format, the sensitivity is set to 3200 (I still allow this value in my shooting) and 6400 (we'll see if I can use this sensitivity in an emergency). For control, a frame was taken at a matrix sensitivity of 100 units. All shots were adjusted to +0.5 stops. This slightly increased the level of noise in the photographs, but exposure errors occur during shooting, so this correction is closer to the practical situation for the photographer. From the test shots were cut out ( photo 1): a) a fragment from the packaging of Shnyr's food (to control text sharpness and color distortion); b) a scale with fields of different lightness (control of the strength of noise in different tonalities); c) a fragment of the body of the mythical creature Gava (for greater beauty). On photo 2 we see that with increasing sensitivity, noise spots grow in all target fields, which is quite natural and expected.
Photo 1: test photo.
Photo 2: increasing the sensitivity of the camera matrix leads to increased noise.
Photo 3: Luminance noise reduction reduces the sharpness of fine details in the image.
How to remove noise in Photoshop (Photoshop).
Oh, pranksters, didn’t shoot in RAW format or forgot to remove noise at the stage of converting a RAW file? Sometimes it happens. Open our photo in Photoshop, then in the menu: Filter> Noise> Reduce Noise… (Filter> Noise> Reduce Noise…). Here is our first tested noise reduction.
Luminous noise. It is the first two sliders (Strength and Preserve Details) that are responsible for reducing it. If we pull Strength (Strength) to the right edge, then we will see that the luminance noise is reduced, but the text becomes more blurry ( photo 3). The main evil of luminance noise: the fight against them leads to a decrease in the sharpness and detail of the photo. The attentive reader will notice that the slider Preserve Details (Save details), just, and is designed to ensure that the image does not lose quality. Move the second slider to the right, and you'll see the sharpness and detail return. But noises also return with it, it turns out "they changed the awl for soap." The settings I used for ISO 3200: Strength - 9, Preserve Details 6%. If your photo does not have small details, like text, texture, then Preserve Details can be reduced up to 0. For ISO 6400, these settings turned out to be rather weak, so I increased Strength to 10, and Details was reduced to 3%, somewhat to the detriment of text sharpness ( photo 5).
Chromatic (color) noise seems to be the lesser evil. By moving the Reduce Color Noise slider to the maximum value ( photo 4) text sharpness is not reduced, color noise almost disappears, but small objects lose color saturation (look at the red and blue box). Also note that a colored halo is formed around the red dies. Sometimes, such a change in the color of small details can be critical and impossible for a photograph. Therefore, we should try to apply noise reduction to a minimum degree: for ISO 3200 I applied the Reduce Color Noise value of 70%, and for ISO 6400 - 100%.
On photo 5 and 6 you see the result of noise reduction in Photoshop. If for ISO 3200, after noise reduction, noise manifests itself at a tolerable level and there is still some reserve for their greater suppression, then for ISO 6400 they are already excessive for some shootings, and I would try my best to avoid using this sensor sensitivity.
Photo 4: Reducing color noise can result in reduced color detail and color halos.
Photo 5: reduced noise in Photoshop, ISO 3200.
Photo 6: the result of using Photoshop noise reduction for ISO 6400.
Conclusions: Reducing luminance noise is impossible without reducing the sharpness of the photo. The use of noise reduction makes it possible to use a sensitivity of 3200 units, but a sensitivity of 6400 may not be suitable for increased requirements for photo quality. If you take photos for the Internet or small print, then I can use a sensitivity of 6400 units. By reducing luminance noise in a photograph, we do not get rid of chromatic noise, and vice versa.
Chromatic noise reduction in photography can sometimes go unnoticed by the viewer. But if color accuracy in small details is important when shooting, then excessive use of noise reduction settings in Photoshop is unacceptable, for example, when subject photography or in food photography. The more “gentle” the noise reduction settings we use (not only in Photoshop, in general, any), the better our image after processing.
Digital Photo Professional
The second for this lesson I chose Canon Digital Photo Professional(hereinafter DPP). This is a very simple RAW file converter for Canon cameras, and it is with it that I introduce the students of the photography course for beginners to the possibilities of the RAW format. In order to get to the DPP noise reduction, you need to select the NR / Lens / AOL tab on the Tool Palette (tool palette). Of course, we are interested in the Noise reduction block (noise reduction), in which there are only two sliders: Luminance ... - to reduce luminance noise, and Chrominance ... - for chromatic ( photo 7). As in the case of Photoshop's noise reduction, I tried to use such settings in DPP to maintain a balance of quality for fine details and smooth surfaces. For ISO 3200, the following parameters were used: Luminance - 7, Chrominance - 12 ( photo 8). For ISO 6400 - 12 and 20 respectively ( photo 9). The result is very similar to the one obtained in Photoshop's noise reduction.
Setting noise reduction in DPP. I've noticed that with my camera's noise reduction turned off, DPP applies its own noise reduction to RAW files. Turning off photo noise reduction every time is not convenient, so you need to make sure that DPP does not use it by default. To do this, go to the DPP settings (Ctrl + K keys), go to the Tool palette tab (tool palette), turn on the Set as defaults switch, set all sliders to 0, click OK, and restart DPP ( photo 10).
Photo 7: Canon Digital Photo Professional noise reduction.
Photo 8: The result of using DPP noise reduction for ISO 3200.
Photo 9: the result of applying the same noise reduction for ISO 6400.
Photo 10: DPP noise reduction settings.
Capture One
To date, Capture One is my main RAW file converter. As in the case of DPP, its noise reduction ( photo 11) is not disabled, and applies to RAW files regardless of camera settings. Moreover, even when there is no need to reduce noise, for example, at low sensitivity. I did a little research on the noise reduction algorithm in Capture One, and it interested me so much that I decided to read the help of this RAW converter. Alas, none useful information according to the principles of noise reduction in Capture One, I did not find it. Therefore, the results of my conjectures, assumptions and research will be described below.
According to Capture One help, the noise reduction of this converter changes its settings after the file is analyzed. I confess that for several years of work in Capture One, I adjusted the settings for its noise reduction only a few times. Noise canceling works so gently, intelligently, unobtrusively and excellently in automatic mode that I just forgot about its existence.
The first thing I checked was how my photo would improve when I removed the noise reduction settings for ISO 100. And nothing happened. That is, if there is no noise, then noise reduction does not work. Then I noticed that when increasing the sensitivity, only the Color value (affecting color noise) changes, but not Luminance (luminance noise). Then I assumed that with the same value of Luminance and with increasing sensitivity, luminance noise would grow in proportion to how it happens in the absence of noise reduction. It wasn't there. Noise increased, but not so much. I'm not going to guess how this happens, but I was pleased with the result of the intelligence of Capture One.
In the next experiment, I tried to find the minimum noise reduction setting that would satisfy me, and compare how much softer my settings are with those that Capture One offers by default. The changes were so minor that they can be neglected: for ISO 3200, Capture One suggested a value of 25 and 54 (Luminance and Color), but I found softer values \u200b\u200bto be acceptable: 20 and 50, respectively. For ISO 6400, Capture One's own noise reduction settings completely satisfied me, and I did not touch them (25 and 57).
There are a few other goodies to make noise reduction even more effective. Surface (surface) allows you to reduce large-scale noise spots on low-contrast, smooth surfaces, while not touching fine details such as text (value 70 for ISO 3200 and 90 for ISO 6400). Single Pixel allows you to remove single pixel noise (individual knocked out pixels) without losing fine details. True, such pixels appear only at ISO 6400 or when the matrix overheats in Live mode view. Despite the fact that the sensitivity of the matrix of 6400 units was used in the noise reduction test, I did not use this setting Capture one, since exposure to the main tools was sufficient.
I am very pleased with the quality and features of Capture One noise reduction. Unlike the denoisers discussed above, Capture One does not create color halos or reduce color saturation in small details of the image. Color noise in shaded areas is also significantly better suppressed than previous competitors. This speaks of high quality color noise reduction algorithm. Thanks to the Surface action, luminance noise also looks weaker, especially on plain surfaces.
You can see the results of noise reduction in Capture One on photos 12 and 13. However, it remains to test a competitor among RAW converters - denoising in Lightroom.
Photo 11: Capture One noise reduction.
Photo 12: the result of using Capture One noise reduction for ISO 3200.
Photo 13: the result of applying the same noise reduction for ISO 6400.
Lightroom and Adobe Camera RAW
I even downloaded the new Lightroom - 4.3... In all previous versions of Lightroom, its noise reduction, according to users, was considered a weak link and was not recommended for use. Those. after converting RAW files to Lightroom, noise reduction had to be done in Photoshop. But Photoshop's noise reduction loses much in the quality of at least Capture One, and I can't recommend this chain (Lightroom > Photoshop) for noise reduction. Out of the corner of my ear, I met a mention on the forums that Lightroom noise reduction, starting from the fourth version, has been improved. Wanting to clarify this information from experienced users, I again ended up on the Lightroom forums. And what I read there did not please me in any way: brakes, difficulties in work, glitches, in general, everything is as always with the RAW file converter from Adobe. This finally turned me off from installing Lightroom, and instead of its noise reduction, I will test a similar Photoshop tool - Adobe Camera RAW. I noticed a long time ago that the settings of these two Adobe products are identical, and lead to the same results after processing RAW files. That is, the operation algorithms of both programs are the same (it would be strange for one manufacturer to make two versions of noise reduction). If I'm wrong and you have a good reason for this, please let me know.
In order to reduce noise in Adobe Camera RAW, you need to go to the Detail tab (Details). This noise reduction has more settings than the noise reduction in Photoshop (photo 14). By default, for files of both sensitivities, Camera RAW offers not to reduce luminance noise, but to reduce color noise (Luminance - 0, Color - 25, Color Detail - 50). At these settings, color noise is nicely suppressed, and (as in Capture One) I don't notice any color halos. Wonderful. The Color Detail slider (color details) helps to adjust (return) color saturation for small details (remember, Photoshop had a problem with noise reduction). I left the default Color Detail value, i.e. 50. But I lowered the main Color setting to 15 (for ISO 3200) and 20 (ISO 6400).
Luminance patches on smooth surfaces remained visible but unobtrusive at Luminance values of 55 (for ISO 3200) and 70 (ISO 6400), but did result in a slight reduction in text detail. Therefore, I chose a compromise value of Luminance Detail - 40 (for ISO 3200) and 50 (ISO 6400).
I really liked how Adobe Camera RAW reduces noise ( photos 15 and 16) that I was wondering if a wider use of the 6400 sensitivity on my camera is acceptable. If we added the Surface setting as in Capture One to this noise reduction, then it would have no equal. I wonder how the places among the noise reduction leaders will be distributed at the end of this photography lesson.
Photo 14: Adobe Camera RAW noise reduction (settings identical to Lightroom).
Photo 15: The result of using Adobe Camera RAW noise reduction for ISO 3200.
Photo 16: the result of applying the same noise reduction for ISO 6400.
Noise reduction test results
The results of the noise reduction test in photos 17 and 18: the worst - at the top, the best - at the bottom. When shooting at high sensitivity values, I do not recommend using Photoshop's noise reduction for bitmaps and Canon Digital Photo Professional. The main reason is strong color halos around colored parts in the photo. Also in these noise reduction devices it is difficult to find a compromise between the level of luminance noise on smooth surfaces and the sharpness of fine details. Capture One, against the background of the first two, looks to be in a winning position, until Adobe Camera RAW noise reduction comes into play. The latter showed that in many cases I can use the 6400 sensitivity for commercial shooting as well: amazing luminance noise reduction for smooth surfaces while maintaining fine details and good job to reduce color noise. What do people working in Lightroom complain about, I don’t understand?
Photo 17: Comparison table of noise reduction for ISO 3200.
Photo 18: Comparison table of noise reduction for ISO 6400.
Photo 19: Charming noise.
Conclusion
If during shooting you want to use high sensitivity values, then start dealing with noise at the shooting stage - shoot in RAW format. Do not shift the noise reduction process to Photoshop, do it in the RAW converter when correcting photos. Use the converter that with less loss (and loss is inevitable) will reduce the noise in the photo. Use the minimum noise reduction settings.
If the photo has strong noises, then in some cases it is possible to limit ourselves to reducing only color spots. The remaining luminance noise will be very similar to film grain. Sometimes such grain imitation is even more preferable than a smooth picture. digital camera. For example, if you stylize a photo as an old one. In other cases, the grain can give a certain charm to the picture ( photo 19). No wonder there are Photoshop filters that create a similar film grain. But, that's a topic for another lesson.
PS: Not the latest versions of Adobe Camera RAW and Capture One were used in this noise reduction test. Therefore, it is possible that the noise reduction algorithms in these programs have become even more advanced.
PS: Don't make noise!
Hello dear readers, today I will tell you how to remove noise in Photoshop so that your pictures taken at high ISOs look as clear as possible and do not annoy you with unpleasant graininess that immediately catches your eye.
Modern cameras often set themselves to a higher sensitivity value if the photo is taken in a dark room or on the evening streets. As a result, an unpleasant scattering of multi-colored pixels appears in the photo, which is called digital noise. This phenomenon is especially noticeable in the dark areas of the frame. To get rid of this unpleasant phenomenon, and make your picture much better and cleaner, you should use a simple trick.
Open the image in a graphics editor.
Create a copy of the photo layer by pressing the keyboard shortcut CTRL + J.
After that, go to the Channels tab and select among them the channel on which the noise is most noticeable. Usually it's red.
Drag this channel to the icon for creating a new channel, which is located next to the trash icon on the Channels tab.
After that, select the menu "Filter - Styling - Select Edges"
Then you need to select "Filter - Blur - Gaussian Blur".
In the dialog box that opens, select a radius from 2 to 3 pixels.
Press the Ctrl key on your keyboard and click on the icon with the editable color channel. After that, click on the icon with the RGB channel and return to the "Layers" tab. Here, click on the "Add Layer Mask" button.
After that comes the final stage of getting rid of the consequences of high photosensitivity. At this stage, you need to select the item "Filter - Blur - Surface Blur".
In this case, experiment with the radius indicator until the result completely suits you.
Now you know how to remove noise in Photoshop and you can do it with any of your photos, making them as clean and beautiful as possible.
Noise can ruin the most beautiful photo, which is why it is so important to be able to remove it programmatically. Using Photoshop, you can significantly improve a noisy photo by improving its quality with the help of special filters.
In the photograph taken as an example, the background noise is visible only when approaching, but it spoils the impression of the work. Let's try to fix this using the standard program filter.
Select Filter>Noise>Reduce Noise and set the values in the dialog box that opens. For this image, the settings are as follows:
As a result, the color noise is gone, and in general the image looks much better:
Even a photo can be corrected in Photoshop Low quality. An example of a photo with strong color noise taken in poor lighting:
Open the image in Camera Raw; To do this, select File>Open As and select the following format:
The first thing to do is to remove chrominance noise, for this we go to the corresponding filter menu, marked with an icon of black triangles.
Set the Luminosity to its maximum and then adjust the Luminosity Info so that the image doesn't look flat. After applying these settings to the preview, you can see that the photo has become blurry and has lost the clarity of the contours. You can restore the sharpness using the "Sharpness Adjustment" menu - adjust the position of the "Effect" and "Radius" levers until you get a satisfactory result.
Now you can evaluate the quality of the improved image using before and after photos.
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