Photo by kevenlaw
I. White Balance of Digital Camera
More than a hundred years ago, photographers had no choice but to take black and white images, and in the 20th century, photographers began to contact with color photography; nowadays, digital cameras in the hands of photographers are designed to take color images. In fact, before the photosensitive elements of digital cameras convert exposure information into images, they first judge the light source of the scene environment, and then calibrate the image tone to a color close to that seen by the naked eye. Through different white balance modes of the camera, the photographer can display different color effects of the image.
2. Correction of image color temperature
At present, the automatic white balance mode of digital camera can provide quite accurate color temperature, but in indoor lighting environment, the image will often appear color bias. Photographers should correct color temperature by using the corresponding white balance mode, for example, under the tungsten filament lamp source, they should use the white balance mode of tungsten filament lamp to shoot; in the light tube, they should use the white balance mode of tungsten filament lamp to shoot. The white balance mode of light tube is used under the light source; the menu of digital cameras has provided relevant diagrams, such as the white balance mode of tungsten filament lamp will be shown in the diagrams of tungsten filament lamp, and the photographer can see the meaning of the diagrams.
Before correcting white balance, the picture is yellowish.
After correcting the white balance, the picture returns to normal.
If the photographer finds that the effect is still unsatisfactory, he can use the manual white balance mode, i.e. field correction. The photographer can generally place the gray or white objects under the final light source and use the camera to measure them. Because the manual method of setting the white balance for each camera may be different, the photographer can refer to the instructions of individual cameras.
3. Strengthen image color
Another function of white balance is to enhance the existing color of the image itself. Simply choosing the balance mode of cloudy sky and white or the balance mode of shadow and white can enhance the warmth of the image.
Balance of cloudy days and white days
For photographic creation, there is no absolute "accurate" white balance in the image. Photographers can even choose a "wrong" setting to get the desired atmosphere of photography. For example, when shooting a dusk scene, deliberately using incandescent lamp incandescent balance mode can make the image take like early morning. However, when using this technique, the photographer should pay attention to whether there is a subject in the image, because the color of the human face and skin will become unnatural due to color bias. The following examples use different white balances to shoot night scenes of Victoria Harbour, from which you can see that different settings can show different atmosphere.
Solar white balance
White Balance of Tungsten Filament Lamp
White Balance of Light Tube
5. RAW File Adjustment White Balance
Because RAW files store the basic exposure data of the image, the photographer can use software to read the RAW files and adjust the white balance at the end of shooting, and then output the image. Therefore, shooting RAW files will have greater flexibility and space in dealing with white balance.
Photographers can use Camera Raw to adjust white balance for the image at the later stage of shooting.
For photographers, white balance is not only a tool to show the normal color temperature of images, but also a tool to help photographers create. The next time a photographer takes a picture, he or she might as well use different white balances to take pictures. The effect may surprise you.