We often hear the word "color temperature" at the shooting site. So, what is "color temperature"? What does "color temperature" mean? The color temperature of
refers to the spectral components of the thermal radiation light source, and the so-called color temperature refers to the amount of light of different wavelengths contained in the light. The color temperature involved in
film and television production should be divided into high color temperature and low color temperature. According to Darwin color temperature standard, the high color temperature standard is 5400K°, and the low color temperature standard is 3200K°.
1. high color temperature : more short light waves. The chromaticity of the light is blue, blue, and purple.
2. low color temperature : long light waves. The chromaticity of light is yellowish, orange, red light. White light contains equal amounts of light of various wavelengths in the visible spectrum. White light includes 7 kinds of light, red, orange, yellow, green, cyan, blue and purple.
Seven colors of light: red, orange, yellow, green, cyan, blue, and purple light wave length table
After understanding the color temperature and the "color temperature" of related lamps, there is a problem to be solved, that is, how to master the change of color temperature. The most accurate answer to
should be to emphasize the uniformity of the color temperature, so as to achieve the correct restoration of the color of the subject in the picture and the normal performance of the picture tone.
If shooting outdoors under sunny conditions, the main illumination light is daylight (color temperature should be 5400K°). If you want to fill light, you need to use a dysprosium lamp with the same color temperature (color temperature should be 5400K°), so that the image tone will be Will be consistent.
If the auxiliary light of daylight uses tungsten spotlight (color temperature is 3200K°), adjust the white balance according to daylight (daylight is restored normally) and the supplementary light will be warmer to orange red. If you adjust the white balance according to the auxiliary light, the fill light will be normal, and the daylight will be cyan-blue and cool, which will produce inconsistent and uncoordinated visual feelings in the picture.
When performing light control under the condition of the same environment and light source color temperature, another important link must be considered: adjusting the white balance (this link only exists in TV production, the film does not adjust the white balance and relies on the development of the light distribution to adjust the picture tone).
3. white balance
In order to ensure that white objects look white under a special color temperature lighting, that is, the color of any scene shot can be correctly restored in the picture, the camera must be compensated for reddish (low color temperature) or The bluish (high color temperature) light will enter the camera lens and be processed by the camera-related functions to make it a pure white light. This compensation made by the camera is called white balance. Camera adjustment channel RVB (red, green, blue) will produce pure white when the three colors are added together.
For this, it needs to be clear that the main purpose of adjusting the white balance is to accurately compensate and adjust the inside of the camera to make it consistent with the color temperature of the scene to be shot, so that it can restore the shot more normally. The color of the scene.
In addition, you can also use the change characteristics of the color temperature to perform white balance adjustments, which can make the TV picture produce color changes, so as to achieve different modeling effects. For example, the use of low color temperature light to adjust the white balance, and the high color temperature light (5600K °) environmental conditions to produce a cyan tone.
