​The color and temperature the aperture in Photography

Every light source has a color, canvas prints which we may not recognize at first sight, but its influence on the atmosphere and emotion of the light environment is very subtle. Even if the light our eyes see is white, it is clearly visible in photographs and can sometimes produce very strong color distortions. With digital white balance, you can always consider the color of the light when shooting, make it match the color of the image or make it easy to modify afterwards.

1. Natural light

The color of the sun changes many times throughout the day: it is blue early in the morning, canvas photo prints online orange at sunrise, and then a scorching red. Toward noon, the light gets closer and closer to bluish white; At sunset, the light transits from deep red through orange to dark yellow. When the sun is going down, it will turn dark blue again and then disappear into the dusk. Depending on the moon's phase, the night is sometimes pale and sometimes dark -- a rarity in cities, where a variety of artificial light sources illuminate the dark night sky.

At different times of the day, photos can contain different colors and emotional depths. The orange light at sunrise and sunset changes the color of the image, giving it a warm, hot, cheap large canvas prints and warm effect. Photos taken at midday are full of color - bright in summer and dark and pale in winter.

If you want to shoot in daylight, in addition to the time factor, you should also consider the environment around the subject, because the environment can affect or reflect sunlight, thus changing the color of the subject. Therefore, the sunlight passing through the leaves will have a green color, and the light reflected through the colored wall will have the color of the wall, which will make the theme take on the same color. Even small color changes can play a role in the viewer's subconscious, thus affecting the overall effect of the image.

Artificial light source

The viewer of a photograph will often tell whether the light in the photograph is artificial or natural by the color of the light. Of course, artificial light can also be produced naturally through a filter or white balance, but an experienced person will immediately recognize that an artificial light source was used in the photograph. Because these artificial light sources all have common colors: incandescent bulbs emit red light, energy-saving lamps emit white light, and some artificial lights emit yellowish or reddish light. The light from a neon tube is mostly green, sometimes blue or yellow. Light-emitting diode (LED) and halogen lamps give off blue light, while construction floodlights are deep red.

The viewer's impression of the color of the light in the image depends largely on the subject of the image. For example, a subject dyed red is more likely to evoke a sunset, while the same effect of light in a closed space is reminiscent of a light bulb or candle.

The principle is to let the viewer see what he can recognize in the photo, but as a photographer you can do more to convince the viewer, mislead him or cause him to form false beliefs. You are free to use different light sources to make the final image look like it was taken in daylight, regardless of the actual conditions. Or you may prefer to use artificial light sources more when shooting, as this prevents the picture from being associated with natural light. Use strong colored light, such as green light or blue light.

3. Flash lamp

Among the light sources available to photographers, flash is particularly useful because it is a very important artificial light source -- either as a portable, flexible, moving flash, or as a studio flash unit that guarantees maximum light power for indoor photography.

Flash light is white, very bright, directional, it does not produce continuous lighting, this has fully explained the advantages and disadvantages of flash: first, white light can achieve a coordinated, realistic color reproduction; Second, through the plastic light equipment can achieve a certain light quality, through the filter can also change its color; Third, the flash can provide high power light; Fourth, the flash time is extremely short. Therefore, the composition of the flash is always determined in the final image. The process of using a strobe light in the studio is simplified by using a continuous lighting strobe light, which is automatically turned off for the moment before the actual flash is triggered.

Since the flash will fade with the square of the distance, it is mainly suitable for shooting close-range subjects, and when only one image layer in the subject is illuminated, the image will quickly become planar -- the image elements in front and behind will be too bright or too dark. To minimize flat images, use multiple flash units for parallel flashes, or (best) use the unit flexibly from the side.

Flash is mainly used for close subjects

If you think only portable camera's built-in flash is a kind of, and thus decided to very dark theme of lighting effect is very poor, you underestimate the light source on the composition of immeasurable space: whether use plastic optical devices in the studio to random control of flash of light, or in the outdoor, in the way of using filter to change the color of the flash, or use it directly without any change. Flash can be used to direct almost all lighting effects, and it can simulate every type of light source.

The flash will fade with the square of the distance

The flash fades with the square of the distance, which means that a doubling of the distance between the subject and the flash reduces the amount of light the camera receives by a quarter. Of the two people in the thumbnail, only the one in front is accurately exposed (left). To change this, either use the off-camera flash and the moving flash to keep the two on the same plane (center), or use two flash bulbs to properly illuminate each one (right).

4. The white balance

Don't forget to adjust the camera's white balance to the light source of your choice. The white balance defines white based on fixed parameters and describes other colors based on white orientation. This process is separate for each photo as needed. In general, there is several white balance options available based on common light sources. Although automatic white balance is often available, we have to be careful when shooting depending on the subject, because most of the time the brightest areas of the image will be defined as white - even if the area is otherwise colored. When manual white balance is used in any situation, for the sake of accuracy, the subtle color fluctuations of the light source itself should be taken into account when selecting a light source as the reference. This is how a truly white object is defined as white.

Generally speaking, the goal of white balance is to achieve natural tones, and choosing the wrong white balance or adjusting the color temperature in the image editing program until you get a satisfactory result is undoubtedly a more creative application of this tool. By changing the color temperature, the entire image color will change -- either very artificial or artistic, or to convince the viewer that the photo was taken in this light.

White balance contrast

The white balance of an incandescent lamp (left) is very different from the white balance of daylight (center). Relying on automatic white balance (right) doesn't always produce the best image results because the brightest areas of an image are defined as pure white regardless of color.

Using the RAW format, you can adjust the photo's white balance after the fact, or select a different white balance specifically. The JPEG format requires dialogue balance to be determined before shooting.

The combination of sunlight and artificial light can create a significant color deviation in the image, which is conscious of the photographer, because the color deviation is not visible to our naked eye, but it can interfere with the final image.

5.mixed light

If we combine light sources of many different colors together, we can produce what is called mixed light, which is represented by the color deviation in the image in addition to the natural tone. Since the white balance can only be aimed at the light source, only a portion of the subject's color can be realistically reproduced. The choice of light source is entirely up to you, and it's important to reproduce the skin color as realistically as possible.

Mixed light has a very unique charm

In any case, mixed light has a very unique charm, because it can make the color part of the light visible without dominating the whole picture.

At dawn there was a striking mixture of light

If taken at daybreak, hd aluminum prints artificial light will dominate the image more, while daylight will become less apparent. The result is a striking blend of light that gives the photograph an artificial and artistic effect.