How does the camera take pictures with cyan background?

How does a SLR camera shoot real colors?

SLR cameras need to pay attention to the following points when shooting true colors:

1. First, adjust the white balance according to the lighting conditions, subject and background color (different colors, different color temperatures of reflected light);

Secondly, the aperture should be as large as possible. F 10 for indoor shooting is too small. Pay attention to lighting, at least pay attention to distinguish between main light and auxiliary light, in addition to background light, backlight, top light, weak light and so on. , it is best to have more than five lights;

3. If possible, it is best to prepare some lamps with different color temperatures or even different colors (red, blue, green, yellow and purple) to adjust the color temperature or even the lighting color, and there should be soft umbrellas.

4. indoor shooting, a better film should be straight out, and there is no need to adjust it later! In the past, the white balance of film camera could not be adjusted, and it could not be PS in the later stage. Indoor photography is completely solved by photographer lighting and installing filters of different colors in front of the camera.

Main features of SLR cameras:

A major feature of SLR digital cameras is that they can change lenses of different specifications, which is an inherent advantage of SLR cameras and incomparable to ordinary digital cameras.

In addition, SLR digital cameras are now positioned as high-end products of digital cameras, so the area of photosensitive elements (CCD or CMOS) related to the photographic quality of digital cameras is much larger than that of ordinary digital cameras, which makes the photosensitive area of each pixel of SLR digital cameras much larger than that of ordinary digital cameras, so each pixel can show more detailed brightness and color range, which makes the photographic quality of SLR digital cameras significantly higher than that of ordinary digital cameras.

Why is the background of photos taken with SLR always blue?

Do you like the color of this painting?

No matter what camera is used to shoot, the color temperature of the scene environment has an absolute influence on the tone of the photo. Turn on the fluorescent lamp at the scene, and the photos taken have problems in getting along. Of course, SLR can correct the color by testing the color temperature, but if the color difference appears in the image taken as a photo, you can simply use the curve function of PS (press CTRL+M) to deal with it. Click what you think is pure white with a white straw, and the whole photo can correct the color deviation.

Take photos with clear foreground and blurred background:

I. Conditions and methods:

1, large aperture (try to use the largest aperture, limited by the lens);

2. Use a long focal length;

3, the distance between the foreground and the background, it is best that the foreground is closer to the lens and the background is slightly farther from the foreground;

4. It is easier to shoot the background blur effect in macro mode.

Second, the technical essentials:

1, accurate focusing: The focusing of digital cameras is mostly done automatically by the camera. If you use manual focusing, just adjust the focus to the position of the subject. If the distance between the subject and the background is far, the focus of the subject will be inaccurate. Therefore, when shooting with autofocus, we don't need intelligent focusing as much as possible, but use central focusing, aim the focusing frame at the subject and press the shutter half (focus lock) before shooting the scene to ensure the clarity of the subject.

2. Appropriate exposure: overexposure will lose the details and colors of the high-light part (bright part) of the photo, while underexposure will lose the details and colors of the low-light part (dark part) of the photo. Only accurate exposure can truly restore the details and colors of the subject. Some cameras provide manual exposure adjustment mode, and we can adjust the exposure according to the light receiving condition of the subject (regardless of the background exposure). When using automatic exposure, try not to use evaluation metering, because the camera determines the exposure according to the light intensity of the whole picture at this time. If the background is bright, the exposure of the subject will inevitably be insufficient. This is also the reason why some friends' faces will be black when they take portraits. Therefore, central key metering should be used. If the background light is too bright, spot metering should be used to ensure proper exposure of the subject.

3. Set the correct white balance: Whether the white balance is correct is related to whether the color of the subject can be correctly restored. In general, automatic white balance can be used, and manual setting must be used in special light.

4. Treatment of background: A messy background will weaken the expressive force of the subject, while a good background can set off the subject and increase the visual impact. Background processing has the following points:

Blur background: Blur the objects around the subject by using the depth of field of the lens. The so-called depth of field is the range of clear imaging. Before and after focusing, there is a distance where the object is clear in the photo. This distance is called depth of field. The depth of field is inversely proportional to the size of the lens aperture and the length of the focal length, that is, the larger the aperture, the longer the focal length, the smaller the depth of field, the smaller the aperture, the shorter the focal length and the greater the depth of field. Therefore, if you want to blur the background, you must open the aperture and increase the focal length to reduce the depth of field, so that the objects other than the subject are out of the depth of field as much as possible, so that the subject in the photo will be clear, while the foreground and background will be blurred, highlighting the subject. At macro, the depth of field of the lens will also decrease. If the actual shooting does not achieve the expected effect, you can also use PS to adjust. A method of quickly blurring the background with Photoshop. I used Photoshop to process the photos with blurred background.

B, background darkening: change the brightness of the background and highlight the main body. When shooting, the exposure is based on the subject, so that the subject exposure is appropriate and the background exposure is insufficient. When using artificial light, increase the illumination of the subject and decrease the illumination of the background. When the subject is far away from the background, you can also use the flash to shoot the main light to darken the background. You can also use image processing software to darken the background during post-production.

C. Clean the background: When shooting some small objects, you can add a solid background cloth behind the main body, so that the photos will be clean and beautiful. You can also use natural conditions such as the sky, calm and non-reflective water and clean walls to purify the background.

In short, you should take photos with clear foreground and blurred background with large aperture and long focal length. Try to keep the subject close to the camera and the background away from the subject.

Clear foreground and blurred background-the shooting skill of blurring the background (also known as shallow depth of field);

1, macro mode: press the left button (with a small flower sign) to select macro mode when shooting close-up.

2, telephoto mode: remember a "minus plus plus" principle.

"Narrow" the distance between yourself and the subject (pay attention to composition)

"Plus" large focal length (large focal length reduces image quality) (Note: f6 is the wide-angle end and f60 is the telephoto end)

"Plus" large aperture (note: wide angle: F2.8 is the maximum aperture/telephoto: F4.3 is the maximum aperture, and F8.0 is the minimum aperture).