Three tips for fast elimination of image noise

One, image size

In our concept, image size is an order to change the size of the picture, and the function of denoising is not put on the line, if your mind is still stuck in the "a tool must be a tool" in such a framework, then you should be more divergent thinking.

Now, with PS to open the image we want to deal with, at a glance can see the distribution of black porcelain surface noise.

Enter "Image > Image size", in the image size to re-enter the size of the image, you can see my original image size is 1200px wide, high 1604px, we want to make this value larger, but do not change the proportion of the image, that is, to establish a link between the long width.

At this point I re-enter the size of the image, and check the "Resample", in the dropdown box, select "Keep details (enlarge)", the reduced noise module to 88%, of course, this parameter is to see the specific picture of your specific circumstances. In short, the principle used here is to increase the noise and then reduce its high light color, so that it becomes less "eye-catching", you can quickly eliminate noise.

After the completion of the picture and then zoom to the original size, after comparison can find that the noise has been reduced a lot.

　　Second, CAMERA raw filter

CAMERA Raw is originally a PS plug-in developed by Adobe, which is designed to handle the raw files of the SLR digital camera, which is integrated into the software and can be used as a filter after this version of Photoshop CC. The principle of CAMERA raw filters to help eliminate noise is to lighten the noise before reducing its details, in short, let the Noise "sink" down.

Open the image we want to deal with, you can find the whole picture of the quality, in addition to the highlights of the parts are full of noise, and darker color, the quality is not clear.

Locate the filter >camera raw filter, open the filter, and eject the filter's parameters panel. In the parameters panel, find the "Details" icon, which is the red box in the image below.

In the "Reduce Noise" column, the brightness and brightness of the details of the two parameters to debug, do not suddenly the brightness of the slider pull too much, this will make the picture is not too real. Move the slider slowly and try to find the best feeling. These two different combinations of parameters will help you find the balance point, that is, neither distortion nor exposure to noise.

Here, you can look at the contrast before and after the camera raw filter is processed.

　　Third, intelligent Sharpening filter

About sharpening the picture, PS provides a variety of filters, but today we need to use this smart sharpening filter, it is used to eliminate noise because the filter has a parameter control called "Reduce Noise", by adjusting this parameter, you can get the effect of eliminating noise.

Let's open this picture first and see that the noise of this photo is mainly distributed in the face and the hair part of the character.

At this time, we enter the "filter > Sharpen > Intelligent Sharpening", open the Parameters panel, the appropriate sharpening, while sliding the "noise reduction" parameter slider, so that the quality to achieve the desired effect.

If you find that part of the noise is not completely gone, you can perform an intelligent sharpening filter again without affecting the overall picture quality. Compared to the processing before, you can see the annoying noise is gone.

There are a number of ways to eliminate noise, and we're only going to introduce the simplest three of them today, and hopefully we can come in handy at the most difficult times.

Category:

• PS Image Processing