How to adjust white balance

Question 1: What does white balance mean? How to adjust? White balance is a very important concept of camera.

? The so-called white balance is the restoration of white objects by the camera. When we look at the world with naked eyes, we feel the same color under different light. For example, when the sun rises in the morning, we look at a white object and think it is white. And when we see a white object in the dim light at night, we think it is still white. This is because the human brain has adapted to the color reproduction of objects in different light during its growth after birth. But as a camera, it has no adaptability to human eyes. Under different lighting conditions, due to the imbalance of CCD output, the color of the camera is distorted: the image is either blue or red, as shown in the figure.

? The color of the image in the middle of the picture below returns to normal, while the image on the left is obviously blue and the image on the right is red, so the images on the left and right are all images with abnormal white balance.

? In order to understand white balance, we must understand another important concept: color temperature. The so-called color temperature, in short, is to use Kelvin temperature to quantitatively represent color. When an object is heated to a certain temperature by an electric lamp or the sun, it will emit certain light, which contains not only brightness components, but also color components. The higher the color temperature, the more blue components and the bluer the image. Conversely, the lower the color temperature, the more red components, and the image will be reddish. Therefore, if the light that illuminates an object changes, its reflected color will also change, and this change will be reflected in the camera, which will produce different color reduction phenomena under different light. The following table shows the color temperature under some light.

? Color temperature of light source (k)

? Candle 2000

? Tungsten lamp 2500-3200

? Carbon rod lamp 4000-5500

? Fluorescent lamp 4500-6500

? Daylight (average) 5400

? Cloudy sunshine 6500-7000

? Cloudy sunshine 12000- 18000

? As can be seen from the above table, the color temperature under different light is very different, which leads to different color reproduction of the camera under different light. In order to solve this problem, all current cameras have the function of white balance correction to compensate different color temperatures, so as to truly restore the color of the subject.

? Now all cameras have the functions of automatic white balance and manual white balance. Automatic white balance enables the camera to automatically correct the white balance within a certain color temperature range, which is between 2500 K and 7000 K. Beyond this range, the camera will not be able to automatically correct the color of the shooting picture, so the manual white balance function should be used to correct the white balance. Please refer to the related articles on using skills for specific operations.

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Question 2: Adjustment of White Balance The English name of white balance is white balance. The color of the object will change due to the color of the projected light, and the photos taken under different light conditions will have different color temperatures. For example, a photo taken under the illumination of tungsten lamp (light bulb) may be yellow. Generally speaking, CCD can't automatically correct the change of light like human eyes. The picture uses natural light. After white balance, the image is blue. If white balance is used in light, the color of the picture will return to the primary color state. White balance will immediately adjust the intensity of the red, green and blue colors of the whole image according to the characteristics of the image in the portrait, and correct the errors caused by external light. Some cameras provide manual white balance adjustment in addition to automatic white balance or specific color temperature white balance function. Balance means that the digital camera defaults to "white" regardless of the ambient light, that is to say, it can recognize white under colored light and balance the tones of other colors. Color is essentially an explanation of light. What looks white under normal light is not necessarily white under dark light, and white under fluorescent light is also non-white. If we can adjust the white balance for all this, we can correctly restore other colors based on white in the obtained photos. Most commercial digital cameras provide white balance adjustment function. As mentioned above, the white balance is closely related to the surrounding light, so the use of the flash will be restricted when the white balance function is started, otherwise the change of ambient light will invalidate the white balance or interfere with the normal white balance. Generally, there are many modes of white balance, which are suitable for different scenes, such as automatic white balance, tungsten wire white balance, fluorescent white balance, indoor white balance and manual adjustment. This white balance has different names in different places, and they describe some white balance settings under ordinary lighting conditions. Generally speaking, users need to point out the reference point of white balance to the camera, that is, which "white" object is used as the white point in the picture. But the question is what is "white". For example, different white paper will have different white colors, some may be slightly yellow, and some may be slightly white, and the light will affect our "white" feeling. So how to determine "true white"? One way to solve this problem is to carry a standard piece of white paper with you and compare the subjects when shooting. This method works very well, so when it is difficult to decide this setting when shooting indoors, you may wish to set the white balance according to the "reference" white paper. When there is no white paper, let the camera aim at the object that the eyeball thinks is white to adjust.

Question 3: How to adjust the white balance One thing that has to be mentioned about how to adjust the white balance is the color temperature. In black and white photography, there is no concept of white balance. This concept is the color cast caused by the influence of color temperature in color photography. Color film solves the problem of white balance by introducing film in various environments (for example, it is suitable for outdoor daylight; Tungsten lamp, incandescent lamp, etc. Indoor or at night ... all kinds of movies). When a digital camera appears, you can adjust the white balance directly on the camera, which is more convenient (the web settings of digital cameras include sunlight, tungsten lamp, incandescent lamp, fluorescent lamp, custom and automatic white balance, etc. ). Normally, automatic white balance can handle most shooting. Ok ~ let's talk about the relationship between color temperature and white balance ... white balance, which literally means white balance. Then what is white? This involves some knowledge of chromatics. White refers to the visual response of light reflected to people's eyes because of the same proportion of blue, green and red light and a certain brightness. We all know that white light is made up of seven colors: red, orange, yellow, green, cyan, blue and purple, and these seven colors are made up of red, green and blue in different proportions. When the proportion of the three primary colors of a beam of light is the same, it is customarily called achromatic, and the light reflected by black, white, gray, gold and silver is achromatic. The public's understanding of white is brightness without color components. The white or other colors seen by human eyes are related to the inherent color of the object, the color temperature of the light source, the reflection or transmission characteristics of the object, the visual perception of human eyes and many other factors (please refer to the principles of chromatics). For a simple example, when colored light illuminates an achromatic object, the color of the reflected light of the object is the same as the color of the incident light, that is, the white object is red when illuminated by red light. When two or more colored lights illuminate the achromatic object at the same time, the colors of the object show additive effect. When colored light shines on a colored object, the color of the object decreases. For example, yellow objects appear red under magenta light, green under cyan light, and gray or black under blue light.

Another very important concept, DD color temperature, should be clarified before understanding white balance. The so-called color temperature, in short, is expressed quantitatively by Kelvin temperature (K). Kelvin, a famous British physicist, believes that if a blackbody substance can absorb all the heat falling on it without loss and release all the energy generated by heat in the form of "light", then it will become different colors due to the level of heat. For example, the thermal stress on the black body will turn dark red when it is equivalent to 500-550℃, yellow when it reaches1050-1150℃, and blue when the temperature continues to rise. The color composition of the light source corresponds to the thermal temperature of the blackbody, and the color temperature of any light is equivalent to the "temperature" when the blackbody emits the same color. This temperature is used to indicate that a certain color light is different from other characteristics, that is, the color temperature. In the process of striking iron, black iron gradually turns red in the furnace temperature, which is the best example of blackbody theory. Color temperature phenomenon is very common in daily life, and I believe people are no strangers to it. Tungsten lamp is yellow because of its low color temperature, and different street lamps also emit different colors. The flame of natural gas is blue because of its high color temperature. The color temperature of cloudless blue sky in Wan Li is about 10000 K, that of cloudy days is about 7000~9000 K, that of sunny days is about 6000 K, that of sunrise or sunset is about 2000 K, and that of candlelight is about 1000 K. At this time, we can easily find a rule: the higher the color temperature, the bluer the light; The lower the color temperature, the redder it is. When the color temperature of a certain color light is higher than other colors, it means that the color light is bluer than other colors, and vice versa; Similarly, when the light of one color is bluer than the light of other colors, it means that the color temperature of this color light is higher, and vice versa.

The English name of White Balance is white balance. The color of the object will change due to the color of the projected light, and the photos taken under different light conditions will have different color temperatures. For example, a photo taken under the illumination of tungsten lamp (light bulb) may be yellow. Generally speaking, CCD can't automatically correct the change of light like human eyes. The following pictures show different images under different colors of light.

The picture uses natural light. After white balance, the image is blue. If you use white balance in light, the color of the picture will be ... >>

Question How does photoshop correct the white balance? You can try the shortcut key: Ctrl+Shift+B, and try automatic coloring!

Question 5: Steps of white balance adjustment There are three steps to adjust the black-and-white balance: first, choose the appropriate color filter (coarse tone); Second, check whether the aperture is in the automatic position, and select A or B (not P) with the white balance button; Third, aim at a piece of white paper or other white objects, move the white switch, and wait for the video recorder to appear OK! (white balance completed), and then adjust the black balance. If the black balance is not adjusted, the dark part of the picture will have a color cast and the contrast will be weakened. Black and white balance adjustment is the main method to control the color tone of the picture. Adjusting the balance between black and white is a technical skill and a creative means. Different whitening methods can get different tone effects.

Question 6: How to adjust the white balance of the camera? So, I'll introduce you to the white balance you neglected, but my introduction will be as simple as possible and very practical. How to adjust the white balance? The reason why we adjust the white balance is to restore the accurate color of the image! This raises a question, why do you need to get accurate colors when shooting? In daily shooting, you may notice that sometimes objects turn orange, blue and yellow when shooting, even though they look normal at the shooting scene. This is because the objects in the wedding photo studio come from different light sources, and different light sources have different "colors" (we also call them "color temperatures"). When the actor is illuminated by fluorescent light, it will turn blue when taking pictures; Objects illuminated by incandescent lamps are colored with yellow tones. Therefore, when the outside light is cold light (blue light or green light), you'd better set up the camera to improve the color temperature; When the outside light is warm, you'd better set the camera to reduce the color temperature. Automatic: This is the best guess of the current light when the camera shoots through the lens. You will find that this model is applicable in many cases. Incandescent lamp: this mode is usually represented by a small light bulb, which is usually used for indoor shooting to cool the color in the photo. Fluorescent lamp: Compensate for the cold light and make the light you photograph warm. Daylight: Not all digital cameras have this setting, because it is a very normal white balance setting. Cloudy: Generally, this setting can compensate for warm colors more than daylight mode. Flash: The flash of a camera is very cold light. Turn on this mode when you turn on the flash. Holography makes your photography warmer. Shadow: Shooting in shadow is colder than direct sunlight, so this mode will make your photos warmer. Using the preset white balance settings, you will get very accurate results in many cases. But some more advanced digital cameras can set manual white balance to make your colors more accurate. This method is usually realized by telling the camera what is true white in the current situation.

Question 7: How to accurately adjust the white balance of SLR? First, take a picture of a pure white object, which can be a white wall, white paper and a white balance board (this thing is available online). Then select custom white balance in the function options to set this photo as reference white. Then select custom white balance in the white balance option. If you can't focus, you can choose to focus manually or turn around and shoot after half-pressing the shutter to lock the focus at the object with the dividing line.

It's that simple.

Question 8: Give an example of the adjustment and use of "white balance"? Several concepts of dialogue balance

Many people are not very clear about the concept of white balance, let alone how to set the adjustment correctly, so that many people who are new to digital cameras are not satisfied with the color of the photos taken. To truly understand white balance, let's look at the following concepts.

Different light sources emit different colors of light. The hue of different light is described by color temperature, and the unit is Kelvin (K). It is defined as follows: when an ideal pure black metal substance is heated at room temperature, the object will show different colors with the increase of temperature. People call the temperature of displaying different colors color temperature, and define the hue of visible light by this standard. The color temperature of cloudless blue sky in Wan Li is about 10000 K, that of cloudy days is about 7000-9000 K, that of sunny days is about 5600K, that of fluorescent lamps is about 4700 K, that of iodine tungsten lamp is about 3200k, that of tungsten lamps is about 2600 K, that of sunrise or sunset is about 2000 K, and that of candlelight is about 654300.

Under different lighting conditions, the color of the target will change. In this respect, people are most sensitive to the change of white objects: under the indoor tungsten lamp, white objects will look orange, and the scenery photographed under such lighting conditions will look pale yellow; But if it is under the blue sky, there will be a blue tone. The scenery taken under such lighting conditions will be blue. In order to minimize the influence of external light on the target color, the original color of the target can be restored under different color temperature conditions, which requires digital cameras to correct the color to achieve the correct color balance. White objects reflect all the visible spectrum, so digital cameras set this as the standard. When manually adjusting the white balance, the white balance mechanism will try to modulate other colors other than pure white into a certain range of pure white. If this part is yellow, it will strengthen the blue to reduce the yellow in the picture, so as to obtain a more natural color. Digital cameras can correctly restore other colors of white objects under the same lighting conditions as long as they correctly restore the white objects when shooting them. So it's called white balance adjustment. It can be divided into automatic adjustment and manual adjustment. Manual adjustment is more accurate and the adjustment range is wider. Traditional cameras rely on different films (sunlight type, illumination type) or different color filters to achieve correct color balance.

In order to get more correct color reproduction, it is necessary to adjust the manual white balance under the light source of the shooting scene. Specific operation: If there is a pure white object (such as a pure white wall) in the shooting scene, aim the lens at it to make it fill the camera viewfinder and adjust the manual white balance (different machines have different adjustment methods, please refer to the manual, and generally press and hold the manual white balance button 1-2 seconds to complete the system prompt). See what happens to the screen (SLR digital cameras can't see the adjustment effect immediately)? If there is no pure white object in the shooting scene, it is best to bring a piece of white paper to adjust the white balance, but it must be done in the light of the shooting scene. Of course, we can also use the principle of manual white balance to set the color cast effect we need. For example, aim the camera at a blue object (such as the blue sky), adjust the white balance and shoot the sunrise and sunset.

Question 9: How to adjust the white balance of Canon 650d There are three ways to set the white balance of Canon EOS 650D.

A. directly press WB on the right cross navigation key of LCD screen, and set the white balance through the impeller.

B Press the speed control shortcut "Q" on the right side of the LCD screen, and set the white balance through the cross navigation key.

C, shooting in RAW format, and later adjusting the white balance through PS and other software.