As an important setting in the camera, White Balance/WB is one of the most commonly used options after aperture, shutter and ISO. It enables the camera image to accurately reflect the color condition of the subject, including manual white balance and automatic white balance. A lot of people have this problem with video cameras: pictures taken in a fluorescently lit room appear green, pictures taken in tungsten light appear yellow, and pictures taken in daylight shadows appear inexplicably blue because of the white balance. So setting a white balance in the camera tells the camera what kind of color the light is, rather than telling the camera to change the picture directly to the specified hue.
I. Basic concept of white balance
The name of the White Balance is White Balance. The so-called white balance is to adjust the ratio of red, green and blue primary colors under different light conditions, so that they become white after mixing. The photography system can get accurate color restoration under different lighting conditions. The camera uses a circuit to change the gain of electrical signals produced by different colors of light to achieve accurate white balance. The color of the object will be changed by the color of the projected light, and the photos taken in different light situations will have different color temperatures. The purpose of setting or adjusting the white balance is to realize that the relevant components of the camera can quickly and accurately “recognize” white under various light conditions. Once the white is accurately identified, other colors under the same light conditions will obtain accurate tone performance.
So, even though it’s called “white balance,” it’s not just about getting an accurate representation of white, it’s also about getting an accurate representation of all colors, but using white, which is easiest for the human eye, as a baseline to get all colors in balance. At present, most cameras provide automatic white balance adjustment function, and some professional cameras provide a variety of white balance Settings.
Take SONY FCB-EV7520 as an example, in its white balance function module, provides AWB automatic white balance, automatic tracking white balance, indoor white balance, outdoor white balance, single push white balance, manual white balance, outdoor automatic white balance, sodium steam light automatic white balance, sodium steam light outdoor automatic white balance and focus automatic white balance; In the color temperature/filter mode, a choice of color temperature values from 2000K to 10000K is provided.
FCB-EV7520+ UAV special interface board
Two, SONY FCB-EV7520 white balance mode
1. Automatic white balance
This mode uses the color information of the entire screen to calculate the white balance value output. It outputs the correct values using color temperature radiation from a black subject in the range from 2500K to 7500K. This mode is the initial setting.
2, ATW automatic tracking white balance
Automatic tracking white balance (2000K to 10000K).
3. Indoor white balance
3200K basic mode.
4. Outdoor white balance
5800k Basic mode.
5. single push white balance
Single Push white Balance mode is a fixed white balance mode that can be automatically readjusted at the user’s request (single push trigger), assuming that a white subject, under the correct lighting conditions, occupies more than 1/2 of the subject submitted to the camera. When the power is off, the single push white balance data is lost. If the power is off, reset the one-button white balance.
6. Manual white balance
This is a mode that enables you to manually set control R and B gain up to 256 steps.
7. outdoor automatic white balance
This is an automatic white balance mode designed for outdoor use. It allows you to capture images of natural white balance in the morning and at night.
8. sodium steam lamp automatic white balance
This is an automatic white balance mode compatible with sodium steam lamps.
9. White balance of sodium steam lamp
This is a fixed white balance mode specifically used for sodium vapor lamps.
10. Sodium steam lamp outdoor automatic white balance
This is an automatic white balance mode designed for outdoor use and is compatible with sodium steam lamps.
11. Focus automatic white balance
Allows you to focus on specific areas and adjust the white balance.
It can be divided into 6 pieces vertically and 8 pieces horizontally.
When this part is specified, it should be specified at the starting point (1,1) and the ending point (3,2) or the starting point (1,2) and the ending point (3,1). Make sure you specify it diagonally.
FCB-EV7520 Focus Automatic White Balance
SONY FCB-EV7520 white balance mode has a lot, users can choose different modes according to their actual needs, if the white balance mode is not familiar, can be directly adjusted to automatic white balance on the line.