Mobile phone photography, how to measure light accurately? An article teaches you to play with “photometry”

It is a strange word for many entry-level mobile phone photographers to mention “photometry”. However, photometry is the basis of accurate exposure, and mobile photography is no exception. < / P > < p > then, how to measure the light accurately in mobile phone photography? Let’s take Huawei’s P30 Pro as an example to see how to play “photometry”. < / P > < p > this is also a commonly used way of light measurement. As long as you click on the mobile phone screen, you will see a box and a circle on the screen. The big box is the focus box, and the small circle is the light measurement box. By default, the positions of focus and light measurement are the same. When shooting, if you find that the metering position is not correct, you need to click other parts of the screen again for metering and focusing. < / P > < p > metering and focusing are carried out at the same time, which can meet most of the shooting needs, but in some scenes, the location of metering and focusing is in different positions, such as silhouette shooting, it needs to use the separation of focusing and metering. < / P > < p > it should be popularized here. Some brands of mobile phones, such as Huawei and Nubia, can realize the separation of focusing and metering. If your mobile phone does not have its own light metering and separation function, you can use third-party software to achieve this function. Poco camera, camere + and other software are recommended here. How to implement < / P > < p >? Click the screen to select the focus position, long press the yellow circle until a white circle appears in it, and then move it to the new metering position. The brightness of the screen will change with different metering positions. < / P > < p > matrix photometry: a kind of surface photometry, each part of the light is evenly distributed, which is suitable for large scenes and wide areas. It is mainly used in the shooting operation when there is no strong contrast between the shooting objects. Through multi-point sampling and overall operation, the most suitable exposure of the whole picture can be calculated. < / P > < p > central focus metering: measure the light of the whole picture, but the proportion of the focus is assigned to the central area, which is suitable for capturing people, animals and so on. For example, this kind of light effect can be selected for shooting a person’s face; < / P > < p > point light metering: light metering is carried out on about 2.5% of the area around the light spot of the picture, which is mainly used for light metering of small objects, such as backlight, flowers and birds, small insects, etc. There is a saying on the Internet about photometry: point measurement for macro distance, Center for portrait and average for perspective. But this is not absolute. Different scenes and different personal habits. Only by trying more and choosing the right light metering can we make some details more accurate. < / P > < p > I believe that through the above introduction, I believe you already have a clear idea of mobile metering. What really puzzles most people is how to correctly select metering points in different shooting scenes. Here are two typical scenes. < / P > < p > when shooting some scenes with too much light and dark contrast, some detailed areas should be reserved for light metering, such as the shooting of sunset. At this time, you can use the point with moderate brightness around the sky as a standard for light metering, and then you can basically get the picture with accurate exposure. < / P > < p > when photographing backlight portraits, point metering is often used to measure the light on the face of the characters. The “simple exposure compensation” of the mobile phone is used to improve the brightness of the picture and make the color and skin of the characters better. < / P > < p > if you aim at the bright part of the background for point metering, it is easy to cause the main body of the character to be “too dark”. In addition, it is also easy to cause other parts of the picture to be underexposed. The most common example is the shooting of silhouettes. < / P > < p > in addition, in some special scenes, such as backlight and weak light environment, the automatic metering of mobile phone can not meet the requirements, and it also needs the help of “simple exposure compensation”, which is often called “white plus black minus”. < / P > < p > photometry needs practice. For example, for the same scene, under the same light, select different photometry points for shooting comparison, you can quickly master the method of manual intervention photometry, so as to take your own satisfactory photos. Science Discovery