Why should the camera frame be cut?

Five situations in which photography needs cutting.

Five situations in which photography needs cutting.

Some elements that people often overlook are how we cut photos later. We should know that proper frame adjustment will not only destroy the original composition, but also add a lot of color to our picture expression, and even play a role in reversing the dry Kun and turning waste into treasure. Below, I will provide you with pictures that need to be cut, hoping to help you.

1, not according to the three-point composition method.

Although the three-point composition method is not a trendy thing, it has always been considered as a good primary composition rule. The core point of this composition method is that when we take pictures, we can divide the picture in the viewfinder with two vertical lines and two horizontal lines, and then focus on one of the four intersections. However, if the pre-shooting does not follow this rule, then we can also cut the picture in the later stage to make the composition return to trisection. But remember, rules exist to be broken. Sometimes, in some cases, it is better not to use the three-point composition method, so why do we have to cut the picture dogmatically? Therefore, it is necessary to accumulate experience through constant attempts, so as to make better use of scissors weapons to serve photos.

The theme of this photo is not clear enough.

People often regret when they look back at photos. They put too many elements in a photo at the beginning, but fortunately, we can remove all kinds of distracting elements through post-editing. So how to judge what is unnecessary? When we look back at the photos, remember to ask ourselves: "What information do I want the audience to get from my photos? What do I really want to express through photos? " After thinking clearly, we can adjust the border of the photo to better highlight the main body and clearly show the information to be conveyed in the picture.

3, the picture content is insufficient

The top one said "too much" and the bottom one said "too little". Although in most cases, the purpose of cropping photos is to highlight a certain part of the picture, sometimes it is just the opposite. Showing more content in the picture can achieve better results and give the picture more background, thus completely explaining the whole story. This kind of situation usually occurs in landscape photos or environmental portraits, which can often explain the surrounding environment of the subject clearly. However, while pursuing "more", don't forget that composition should follow certain principles and convey information clearly.

4. There are too many safety cards.

One advantage of photography entering the digital age is that we can get a lot of post-processing space, so don't be afraid to cut out your photos. This is not an irreversible process. By adjusting the frame, you may find some picture experiences that you have never tried before, such as panoramic frame or square frame. Using them in specific scenes will produce unexpected effects.

5, did not consider the use of photos.

Photographic works often have many different uses, some are for sale, some need to be printed, and some will be shared on social networks. Especially if you plan to sell your photographic works, it is an essential step to consider where the works will be used. For example, the main photo of the middle part of the picture is not suitable for publication in a folio design magazine, because the middle seam of the magazine will fall right on the main body of the picture; If your photo is not vertical, it is not suitable for the cover of a magazine. In addition, you need to think about whether the border or composition of your photo is appropriate when it is uploaded to the Internet and appears as a thumbnail.

; Aps-c cutting is a conversion cutting coefficient based on Quan Huafu.

The most intuitive explanation is that a lens with the same focal length will get different picture sizes on aps-c and Quan Huafu. aps-c with the same focal length is smaller than that in Quan Huafu, and the picture in Quan Huafu is wider. This size difference is the cutting factor.

Cropfactor is the ratio of camera frame to reference frame. Generally, this term applies to digital SLR cameras, and accordingly, 35mm Quan Huafu film is taken as the benchmark.

Cutting coefficient:

The purpose is to try to help photographers who use SLR cameras understand the performance of their existing lenses on emerging digital SLR cameras with sensor sizes less than 35mm. Taking the focal length multiple of 1.5 as an example, a photographer may say that a 50mm lens behaves like a lens with a focal length multiplied by 1.5 on his digital SLR.

What he means by this is that the camera gets the same angle of view as the 75mm lens on the film full-frame camera that photographers are more familiar with. Of course, the actual focal length of a photographic lens is determined by its optical structure and will not change with the sensor format placed behind the lens.

Most digital slrs (especially entry-level ones) on the market use the nominal APS-C sensor, which is smaller than the standard 24x36mm(35mm) film frame. For example, the sensor size used by many consumer digital SLR cameras is 15x23mm.

In this way, the image data collected by the sensor is smaller than the frame area of 35mm, which is equivalent to cutting off the corners of the Quan Huafu of 24x36mm film. Due to the above cutting, the effective viewing angle decreases proportionally from the smaller sensor size to the Quan Huafu (reference system).

Why should Canon 5d4 shoot 4k video?

The resolution of 5D4 reaches 6720×4480.

This is far beyond the resolution of 4k.

So, in order to get 4k resolution, of course, we have to cut it.

But the wide angle is not wide after cutting, which is a pity.

Many people don't like to cut movies with 4k, that's why.

Seek popular science picture frame cutting and digital cutting and optical zoom?

Nowadays, frame cutting is simply a conversion coefficient called frame cutting coefficient, which "equivalently" converts the range of pictures taken by sensors with different sizes into the standard of 35mm film (that is, Quan Huafu). The reason for this is that in the film era, 35mm film is widely used, and people in the industry can basically judge the viewing angles and corresponding imaging characteristics of lenses with different focal lengths in this specification. Gradually, people invisibly convert angle measurement (field of view angle) into linear measurement (lens focal length). In the transition period to the digital age, due to technical and cost problems, the sensor size of the original digital camera is basically smaller than that of 35mm film, so when using the same lens, the picture taken by the digital camera is only equivalent to the central part of the picture taken by the film camera, and the picture range is obviously smaller, so people call this situation frame-changing editing, which probably refers to the central part cut from a complete photo. Later, in order to calculate the lens perspective uniformly, people widely used this so-called cutting factor. Of course, in fact, Quan Huafu is not the largest format specification, so some cropping factors are less than 1. For example, the clipping factor of the frame in 4433 is about 0.8, which has lost its original meaning, just for the convenience of calculating the lens angle.

Digital cutting is basically frame cutting, but sometimes digital cutting is active, that is, for some needs, not all sensors are used, but only some of them are used. Usually, cameras often involve digital cropping when shooting videos. Due to the limitation of picture scale and processing performance, cameras often don't use all sensors when shooting video, which leads to digital cropping. There is also the use of cropping effect to change the perspective. A smaller sensor size can obtain a smaller viewing angle without changing the focal length of the lens. Therefore, sometimes you need to shoot with a telephoto lens in photography, but when you don't have a suitable lens at hand, you can actively abandon some pictures through digital cropping in exchange for an approximate telephoto effect. This is sometimes called extended optical zoom technology. Of course, in essence, digital cutting or extended optical zoom technology does not change the focal length of the lens at all, because the focal length is the physical distance from the optical center of the lens to the imaging plane (now it can be film, CCD or CMOS).

Optical zoom, as mentioned above, the focal length is actually the distance from the optical center of the lens to the imaging plane, so optical zoom is a zoom realized through the optical structure, which is a real focal length change. This is usually achieved by moving some of the shots. Simply put, the larger the optical zoom factor, the farther you can shoot the scene.