Five steps teach you how to denoise easily with Photoshop.

Some friends always find a lot of noise in the photos when they shoot with their mobile phones or cameras at night, which is very unsightly.

How to denoise the picture? This paper introduces several commonly used ps noise reduction methods, each of which has its own advantages and disadvantages, and you can choose according to your own situation.

Photoshop itself has no direct noise reduction function. Generally, in the later retouching, noise reduction is realized through plug-ins. If you don't want to install plug-ins, you can simply modify the channel to reduce the noise. Of course, the latter is certainly not convenient enough and the effect is not good enough.

Let's take a photo taken at a hotel in Bali at night as an example. We can see that the noise in the picture is very high, and the whole picture is like a layer of ground glass.

Step 1, open the picture in ps, and double-click the background picture layer to unlock it;

Step 2, select the filter-camera raw filter in the menu bar above to open the acr filter window; (acr, namely Adobe Camera Raw, is the most commonly used modification filter for photographers in ps retouching. )

Step 3, find the third detail icon on the right side of the opened window, that is, the icon with three triangles superimposed together, and click to open the details interface;

Step 4, adjust the slider to reduce noise. As you can see, the more the slider moves to the right, the more noise there is in the picture. If the picture is blurred, you can adjust the noise reduction amplitude by the contrast and lightness sliders below, or get back some details by sharpening at the top.

Step 5: After you get satisfactory results, press OK to return to the ps interface, and the noise reduction of this photo is completed.

Step 1, open the picture in ps, and double-click the background layer to unlock it;

Step 2, select Image-Mode in the menu bar above, and change RGB to lab color mode;

Step 3, switch to the channel after modification, select channel A, and select filter-blur-Gaussian blur;

Step 4, in the pop-up window, pull the radius slider to the far left to see the noise in the channel, and pull the slider to the right until the noise disappears; Similarly, the B channel and the lightness channel also operate in the same way;

Step 5, switch the mode back to RGB, and you can see that the noise in the picture is much less, but the picture quality will be greatly reduced because of Gaussian blur.

There are countless noise reduction software that can find ps in the market, among which the following two have the best reputation and the widest users: noiseware of Imagenomic and define2 of Nik collection.

Among them, Nik can download the complete free version online, and the former needs to buy or take a treasure channel.

Both methods are simple to use. After installing the filter, you can find the installed filter at the bottom of the filter bar. Click on it, and it will automatically reduce noise. If the general requirements are not high, the effect of automatic noise reduction is already very good.

Below are the noise reduction effects of the two plug-ins.

Imagenomic has a high degree of automatic noise reduction, and the image quality loss is not small. It is suitable for the situation that the noise is too loud to see clearly, and it can be adjusted by itself through the left operation interface.

The effect of define2 automatic noise reduction is very good, and the effect before and after local noise reduction can be seen at the bottom right, which can be said to be very intelligent and accurate.

The above are several common noise reduction methods in photoshop retouching, hoping to help everyone!