How to shoot a clear computer screen

There are two possibilities for a mobile phone to shoot a computer screen:

First, the refresh frequency of mobile phones and computers is different;

The second is the moire fringe.

1, refresh frequency

The refresh rate is usually called the Hertz of the screen. The screen doesn't shine all the time, but it will be refreshed every once in a while, such as 60hz, which means it will be refreshed 60 times a second, but we can't detect the flicker of the screen with our naked eyes.

Image source: Network

However, when a mobile phone is shooting a computer screen, sometimes the shutter speed is relatively fast, which can capture the process of screen refresh if it exceeds the refresh frequency, which is also one of the reasons for the ripple.

At present, there is no way to avoid this kind of stripe, only to improve and slow down, such as: adjusting the ISO value setting; White balance regulation; Saturation adjustment; Adjust the focal length, etc. A more effective method is to shoot diagonally at a distance of one screen width from the screen.

2. Moire fringe

Moire fringe is an image that two lines with similar spatial frequency interfere with each other and are overlapped by two or more groups of different fringes.

Moire fringe is the visual result of interference between two lines at a certain frequency. When the human eye can't distinguish these two lines or two objects, it actually magnifies the difference between stripes. Simply put: Moire fringe is the interference between computer display screen, mobile phone camera and mobile phone display screen.

Image source: Network

For example, if you look at the scenery outside the window, what you see is a clear picture at a glance. But if you add three screens, will it be hazy and striped? These three layers of window screens overlap, which is similar to the visual effect caused by the interference of display screen, mobile phone camera and mobile phone display screen.

Image source: Network

How to avoid moire fringes?

Adjust the shooting angle and shoot obliquely as far as possible;

Adjust the shooting distance;

Screen capture and recording can get clearer results than shooting.

There will be ripples in TV pictures ~ this is the same as taking computer pictures ~

In the past, Bian Xiao discovered this problem when he was shooting at the computer with his mobile phone, but he didn't delve into it. I used to think that this reason was because the mobile phone was too old and the pixels were not good. Today, I understand what is going on. Do you think the same as Bian Xiao? Hahahaha ~

Poke "nice" to remind more people!

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