1. What is white balance
White balance is to maintain the "white" balance, with the "white" of 18% intermediate gray as the standard. The adjustment process of white balance is realized by adjusting the color temperature. It is generally recommended to adjust the white balance to daylight (5200k) on sunny days, and to shade (7000k) or cloudy (6000k) on cloudy and cloudy days. Use a tungsten lamp (3200k) when the indoor light is a tungsten lamp. The light is Use white fluorescent light (4000k) for white fluorescent light.
The differences between photos under different white balances are as follows:
Second, what is color temperature
Color temperature is the color change that people's eyes feel under different energies of light. Kelvin (K) is the unit of color temperature calculation, which is simply the color of light. You often see different values such as K2000, K3200, K4000 in the color temperature value.
The iron-strike phenomenon says the principle of color temperature: "Assuming that a certain pure black object can absorb all the heat falling on it without loss, and at the same time can release all the energy generated by the heat in the form of "light", it will It will change into different colors due to the level of heat."
Iron nuggets range from red to yellow at low temperatures, to white, blue, and green. Iron blocks have different colors at different temperatures, which is the origin of "color temperature".
Color temperature is not how hot or cold the light is, but it measures the color components contained in the light.
Third, the relationship between white balance and color temperature
From the above one and two, we know that white balance and color temperature are two different concepts, because the adjustment process of white balance is achieved by adjusting the color temperature, so the color temperature is a white balance problem for digital cameras.
The standard color temperature value of warm and cold tones and normal daylight environment.
The color temperature is more than 5000K, which is a cool color (the color is bluish) and has a cold atmosphere effect;
The color temperature is 3300-5000K, which is a mid-tone (white), with a refreshing and bright atmosphere effect;
The color temperature is less than 3300K, which is a warm color (the color is reddish), and has a warm and stable atmosphere effect.
How to adjust white balance
The white balance modes generally include: auto, daylight, shade, cloudy, tungsten light, white fluorescent light, flash, custom, etc.
Custom color temperature K, by adjusting different color temperature values, you can shoot disagreements in the same environment, and it is recommended.
In addition to special requirements such as professional photography and videography, which require the use of gray cards, automatic white balance is commonly used and can meet normal needs.
[Summary] See whether the actual color temperature is warmer or colder, adjust the K value according to the needs of the white balance, lower the K value of the white balance if it is warm, and increase the K value of the white balance if it is cold, so as to maintain the "white" balance It's OK.
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