Teach you how to improve lens quality without spending money.

Lead: We all know that Photoshop is a very practical post-processing software, but do you know how to use PS to make up for the lack of imaging quality of your lens? What methods can make your lens look better, and what tips can help you solve the congenital deficiency of the lens in the later stage? I will tell you about them.

Using PS well in the later stage can improve the picture quality without spending money.

We talked about the topic of two issues of equipment before, and this time we will go back to the following issues. I believe that friends who pay attention to our camera series will also pay attention to many evaluation contents brought by our two masters. Among them, we always use a common sentence pattern in lens evaluation: if you don't like XXX effect, you can use PS for simple post-correction. But many friends may wonder: how simple is this simple correction in the late PS? This time, we will teach you how to use PS software to solve some lens problems. Congenital deficiency? .

Do you occasionally feel that the imaging quality of your lens is biased? Dogs? And then what? In fact, this can be optimized in the later stage.

In the digital age, we can already use the later stage to solve many shortcomings of early shooting. What I want to introduce to you here is to use Adobe Camera Raw, a famous plug-in in PS, to solve the problem of congenital deficiency of some lenses. For example, we often talk about a series of problems such as dark angle, distortion and dispersion. After all, I spent a lot of RMB, and it always hurts me to find that the camera is still unsatisfactory. Don't be afraid, this time we will teach you how to solve these terrible problems.

Basic article: the lens correction file is the simplest and most direct.

Since it is post-processing, we will talk about it step by step, starting from the beginning. Of course, before that, we need to reiterate a topic: If you want to save photos later, please remember to shoot in RAW format earlier. This paper mainly deals with the pairing problem between RAW format and Photoshop lens correction file. Today's RAW format file not only records the parameter information of the camera body, but also records the lens you use. And this will also bring a lot of convenience to our post-processing.

Due to the good cooperation between Adobe and major camera lens manufacturers, ACR has become the most practical lens correction software.

Because Adobe's Photoshop cooperates with many camera lens manufacturers, the software can not only read RAW files for post-processing, but also compensate itself according to lens information. In Adobe Camera Raw (hereinafter referred to as ACR) of PS, there is a sub-menu of lens correction, which is what we will mainly talk about today.

Through the lens correction of ACR, a good correction effect can be obtained.

Among the sub-items of lens correction, the first item is the configuration file (provided that the shooting is in RAW format). Under this sub-item, ACR will automatically identify the lens you are using, and then correct the lens if necessary. The easiest way is to correct it through ACR's own configuration file (especially for beginners). The configuration file of the software can correct the dark angle and distortion well, which is also the simplest lens correction method. With it, the common dark angle focusing problem can be well solved.

With the version update, ACR is also expanding its support for various lenses, so it is meaningful to upgrade regularly.

Just a reminder, first of all, this recognition and automatic correction is based on files shot in RAW format. So, be sure to shoot raw, be sure to shoot raw, be sure to shoot raw (the important thing is said three times)! ! ! Furthermore, with the continuous introduction of new lenses by major manufacturers, Adobe will constantly upgrade its software to adapt to these lenses and further optimize the algorithm of the original lenses. Therefore, everyone should regularly check and upgrade their Adobe Camera Raw.

By comparison, we can see that the automatic lens correction of ACR is still very useful.

Late difficulty: ★

Therapeutic effect: ★★★★★☆.

Recommended: ★★★★★

Here is a brief explanation, we didn't give enough in the recommendation, because in fact, we often don't want to completely remove the dark corners of the edges in the picture. If you simply use automatic processing, the dark corners will be completely removed. In addition, as far as deformation is concerned, sometimes its performance effect is not so perfect.

Advanced articles: purple edges are not terrible. Color selection is very important.

Next, let's start with the advanced content. Let's see how to optimize the quality of photos taken by our lens besides automatic processing. First, let's talk about Gao Fancha edge dispersion. In the digital age, the problem of purple edge and green edge is becoming increasingly prominent. Whenever we use a large aperture lens to take a strongly blurred photo, the touching purple or green edge of Gao Fancha is always heartbreaking. Now PS actually brings us a good solution.

Many lenses that have not been digitally optimized are fine on film, but they are very troublesome when they reach the purple edge on the digital body.

When using a large aperture lens, it is easy to encounter the problem of purple edge (or green edge)

Here we still use ACR in PS to solve this problem. Similarly, under the menu of lens correction, there are independent color adjustment sub-items. Here ACR is deliberately divided into green and purple, which is convenient for us to correct. When processing, you need to check Delete Color Difference. Then select the corresponding color number and hue.

By deleting the color manually, the purple edge problem can be better alleviated.

There will be differences in lens design, all of which are edge dispersion, which can be divided into good correction and poor correction. For example, the dispersion of Zeiss, although the purple edge is very heavy under large aperture, is very convenient to correct because the color of the purple edge is very regular. But what if it happens? Colorful? The edge dispersion of the formula can only be partially corrected.

Late difficulty: ★★

Processing effect: ★★★☆ (depending on the lens)

Recommended: ★★★★★★★

Although all lenses have chromatic aberration, they can also be divided into easy correction and difficult correction, even PS which is difficult to correct is invalid.

We strongly recommend that you go to the purple edge operation in the post-processing. After all, the purple edge looks really uncomfortable, but this treatment is really subject to the lens itself. Due to the dispersion in Gao Fancha, some photos show various colors, which makes it difficult to remove them. However, as far as purple border is concerned, the therapeutic effect of ACR is still very good.

Advanced articles: burning brain, all manual, all correct self-control

As a method of lens correction, the relative processing is the most perfect, and the correction effect can best meet the needs of users. There is no doubt that it was corrected by manual operation. Here we also introduce how to manually correct the distortion and dark angle of the lens through ACR.

Before manual correction, you can use the horizontal and vertical correction included with ACR for machining adjustment.

Let's talk about the most basic horizontal and vertical correction. When we take pictures by hand, we often encounter the problem that the finished photos are not horizontal or vertical, which is the most common problem in our later correction. In fact, ACR still provides us with an automatic correction scheme. Under its upright option, users can make corrections according to their own needs.

Manual processing can correct the deformation more accurately.

In addition, ACR also provides a completely manual adjustment scheme, which is classified under the transformation menu: distortion, vertical, horizontal, rotation, scaling and aspect ratio options. Users can drag the slider to control it. Here, you can open the auxiliary grid to facilitate horizontal and vertical calibration (which also helps to correct the deformation).

Opening the display grid can help us to make manual correction.

Manual correction of dark corners is to make photos look more natural.

In addition to distortion correction, ACR also supports the correction and processing of lens vignetting (that is, dark angle/edge loss). ACR can choose the processing range and correction intensity of dark corners, and users can correct them according to their own needs. Because in the actual situation, we will encounter some situations that we don't want to completely remove the dark corners, and the results of automatic correction are often too clean. Instead, manual processing is more natural.

Late difficulty: ★★★★★

Processing effect: ★★★★☆ (Different shooting habits depend on different lenses)

Recommendation: ★★★★☆.

Manual correction+edge chromatic aberration correction, the two processes are basically a complete lens correction.

There is no doubt that from the final effect, the effect of manual processing (especially with color processing) is often the best, or the most in line with user needs. However, compared with the automatic correction of ACR recognition lens, this processing method has much lower processing efficiency and higher technical threshold for correction. Many old friends, or experienced players, naturally recommend this treatment. For novice players, it is still recommended to learn more and try more, and it is also recommended to use the lens correction file to solve the problem.

A new weapon to deal with smog-environmental protection and defogging function

The above is the method we introduced to use ACR to correct lens imaging and achieve better imaging effect. In fact, in addition to these lens corrections, there are many practical processing functions in ACR, and we will briefly introduce them here. The defogging function and sharpening are mainly explained here.

In the imperial city, you can't escape the smog?

Speaking of the most practical tools for us today, how many are there? Remove the mist? Function. The northern region has suffered from quite serious haze weather since winter, and many times the photos we take are always foggy, so the haze removal function can play a role. When the fog and morning fog in the photo shooting environment are not very serious, we can use the defogging function to reduce the gray level of the photo, so as to achieve the effect of defogging.

The defogging function can indeed alleviate the problem of photo clarity/transparency caused by smog to a certain extent.

However, people also say that the function is to remove mist. If the situation of PM2.5 is out of the chart, just like the nearest imperial city, it is obviously not fog. At this time, even with the help of ACR, it is of little significance. Are you okay when you encounter fog and haze? Squatting at home? All right.

Sharpening will perceptually optimize the clarity of the photo.

Post-sharpening will still bring some problems, such as serious graininess and Jiao Wai distortion.

The other is sharpening. I don't know if it is a habit developed by everyone in the digital age. Sharpness is often a standard for everyone to judge many shooting equipment. There will always be friends who think their photos are not sharp enough. What should I do? There are also corresponding sharpening controls in ACR. If you really think the photos are too fleshy, you can really use ACR to optimize them.

Late difficulty: ★★★★★

Processing effect: ★★★☆ (depending on weather and lens)

Recommendation: ★★★☆ (It needs to be used reasonably)

Of course, if the smog has reached this level, why not put down the camera? Squatting at home? Right? (Image from the Internet)

Of these two tools, it is recommended that you use the defogging function, which is really helpful for many photos that are prone to fogging. Of course, because it is helpless in the face of extreme environmental conditions, it is not invincible in this later period. As for the sharpening function, I suggest you use it with caution. Excessive sharpening will bring very obvious distortion problems, and it can indeed weaken some lens imaging to some extent? Have you ever eaten meat? Problems, but excessive use often backfires. After all, good shots are not unreasonable, and the money that should be paid is inevitable.

Make fun of the summary, use PS flexibly and make good use of your own equipment.

This paper introduces some methods and means to improve the performance of lens quality by using ACR(Adobe Camera Raw) plug-in of PS. We show it to you in line with the principle of drawing step by step. I believe that after reading it, you can also get some small gains from your own operation. ACR is indeed a very powerful tool, and correct and reasonable use can really add luster to the quality of our photos.

Seeing that others have good cameras will always make them greedy, but we also hope that everyone can use their own equipment first.

Although our title has been changed, our starting point is to make better use of the equipment in our hands. I believe that when people use other people's good equipment and then look at their own equipment, it will inevitably happen. We hope everyone can be familiar with and make good use of the equipment and equipment in their hands first. Only when you are familiar with the characteristics (advantages, especially disadvantages) of your own equipment can you know what you need to remedy in the later stage and what you can remedy.

Make good use of your own equipment, and through your own post-processing, you can also make your own equipment show better image quality.

Of course, we say that most equipment has an upper limit. Let's get familiar with the pre-operation and post-processing of these equipment, so as to better understand what we can shoot and how good we can shoot. At this time, we can be more rational when buying equipment next, and we can be more clear about what we need.

I also hope that everyone can take more satisfactory photos with their own equipment.