How to adjust white balance

Question 1: How to adjust the white balance One thing I have to mention 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; Indoor or nighttime tungsten lamp, incandescent lamp, etc ... all kinds of internal films). 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, and after white balance, the image is blue. If you use white balance in light, the color of the picture will be ... >>

Question 2: 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 How does photoshop correct the white balance? You can try the shortcut key: Ctrl+Shift+B, and try automatic coloring!

Question 4: 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 5: There are many ways to adjust the color temperature of white balance energy-saving lamps indoors, such as 6400K, 4 100K, 2700K, and the tungsten lamp color temperature is 2800K, which is similar to 2700K. You must know "white balance" when taking pictures. To put it simply: white balance is to let you tell Dan camera that the white tone of the scene at that time was expressed by color temperature; In this way, the photo (sensitivity of red, green and blue film) can be consistent with the scene at that time. If the scene is 4000K, and you set tungsten lamp's 2800K as standard white, the photo will be blue. If you want yellow photos, set the white balanced color temperature higher than the scene; For example, scene 4 100K, and you set it to 6400K.

Question 6: How to control the manual white balance? Manual white balance The area of gray objects (such as gray board) or white objects (such as the back of gray board) should occupy at least 2/3 of the viewfinder. Manual white balance setting does not require the camera to focus on the reference object, so you can change the camera to manual focus mode and set the lens to infinity focus. Just take a business card and you can complete the manual setting in front of the camera. When setting the white balance manually, pay attention to turning off the camera exposure compensation, especially the positive compensation. If the camera sets the white balance of +0.5 gear compensation for white objects, "No Gd" will fail. However, in the case of ISO200, the camera can still read the white balance data correctly with the compensation of-3rd gear. But under high ISO, the negative compensation camera will get the wrong white balance data. Therefore, when setting manual white balance, it is best to turn off exposure compensation.

Correct use of white balance:

When shooting with a flash, the color temperature of light emitted by an electronic flash is basically the same as that of sunlight, so the white balance should be set to sunlight, even when shooting at night. This setting is also good for restoring the color of close-range characters, while the foreground light is generally warm yellow in photos, which most people like. If you only have a distant view and no close-up people when shooting at night, you can set the white balance to incandescent lamp. Don't use automatic white balance when shooting flowers, just adjust it according to the light source at that time. If you shoot flowers in the sun and set the white balance to incandescent lamp, you can shoot white flowers with some blue. At present, classrooms and office buildings in schools are basically illuminated by fluorescent lamps. The fluorescent lamp looks white, but it is actually our eyes that are "automatically white balanced".

The spectrum of the light emitted by fluorescent lamps is not continuous, and can only be expressed by the color temperature of about 4000 K. When shooting under fluorescent lamps, the white balance can be set as fluorescent lamps. If you think the photo is a little green, you can also set the white balance to sunlight, and then add a special fluorescent filter in front of the camera, which is magenta, but it is not often sold in the market.

The most complicated light is the mixed light source, which is most afraid of the participation of fluorescent lamps. There are many kinds of fluorescent lamps, and their color temperatures vary greatly. If there is a dominant light source in the mixed light source, such as using a strong enough flash, then the white balance setting should be flash mode. If the mixed light source accounts for 50% and 50% respectively, it is necessary to measure the color temperature with a gray board. If incandescent lamps are mixed at this time, such as foreground fluorescent lamps, background incandescent lamps or vice versa, you can only take care of one light source, and there is no other way. In addition, if you want to solve some problems of artificial light source quickly, you can also use automatic white balance, but use 80B to increase the color temperature of incandescent lamp from 3000K to 4400K, so that the camera can detect the change of color temperature very accurately. Similarly, under fluorescent light, FLD can also be used to make the camera's automatic white balance work normally, just like a movie machine.

In some special cases, you can deliberately give the camera a wrong white reference point and let the color of the whole picture run in the opposite direction. Just like creating special image effects, you can deliberately use incorrect white balance settings to enhance the ideographic function of color language and achieve special color effects in portrait or landscape shooting.

Question 7: 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.

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 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 How does photoshop adjust the white balance? You are a photographer! ! There are several ways to adjust the white balance in ps.

1. You can adjust the image by selecting the middle eyedropper in the curve tool and clicking the middle position of the image.

2. Adjust the color cast of photos through color balance.

3. Control the color temperature by adding a photo filter to the photo.

4. The best effect can be achieved through optional color adjustment.

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