Is the higher the pixel, the clearer the digital camera is?

However, this is a problem. Where does the clarity of the photo come from? How can we be clearer? How high definition do we need?

Let's talk about pixels first. A pixel is just a point to collect light information, including properties, brightness, color, location and so on. Just collect, then need to process, process into digital information, and then transmit records. The quality of pixels determines the authenticity of the collected information. Each pixel is like a microlens, and the pixel itself can be large or small, so the pixel itself has no size. However, under the existing material and technical conditions, when the area of the photoreceptor is fixed, the relative quality of a slightly larger pixel will be higher, the information will be more real, and the well-processed relative photos will be clearer. But there should not be too many pixels, because in a limited area, pixels must keep a certain distance. In the environment of 100 nm, light particles will interact with each other, which may produce diffraction and affect the pixel quality.

Secondly, let's talk about photoreceptors. A photoreceptor is a collection of pixels, that is, a rectangular pixel array arranged in order according to certain rules. As mentioned above, the characteristics of pixels or between pixels must have certain rules. We don't know how big the pixels of a photoreceptor are, but we can roughly estimate the distance between pixels, the total number of pixels and the material requirements for making pixels from the area. The following set of data is calculated by me personally and may be inaccurate.

1, area: consumer camera photoreceptor area 12-43 mm2, Quan Huafu 855-864, APS-C 332-372, 4/3 system 224, 1 16, micro-single 332-368. All units are square millimeters.

2. The pixels are basically square, and the difference between width and height is about 1 nm. It's a square on PS.

3. Pixel spacing (including pixels): consumer cameras are at 107-208 nm (the same below), Quan Huafu is at 480-845, APS-C is at 385-554, 4/3 system is at 375-433, medium frame is at 600, and micro-single is at 391.

4. The pixel size cannot be determined. The fineness of the picture is related to the distance between pixels, while the image quality is related to the size and quality of pixels. The distance between pixels is not as close as possible, and the pixel points are not as small as possible.

Full-frame cameras with more than 52 million pixels have reached or even exceeded the pixel spacing of film, but the pixel quality of digital cameras is still not as good as that of film because of the different pixel sizes.

Third, talk about sensors. In fact, the photoreceptor and the sensor are connected together, and the sensor is the processor, which is responsible for processing the optical signal into a digital signal. We can know from the nonlinear editing of video that there may be some errors in the processing of information, but it will not affect the use, and there are also problems of speed and quality. This is similar to the "lost frame" in the process of video acquisition, except that a coding number may be lost in a 16 bit code. Of course, there will be redundant data, and removing redundancy means compression, but there is also the problem of data reorganization itself. To form a data file, you need to be "fuzzy" and choose between speed and quality. This will also affect the clarity of the final photo.

Fourth, the issue of exposure. After a series of collection, conversion and processing processes of pixels, photoreceptors and sensors, the quality of light collected by photoreceptors is related to these problems, but the tolerance of each pixel may not meet the requirements of light transition, so the light within a certain tolerance is taken as standard light by step. Professional photographers use professional equipment to shoot. When considering the image quality of the camera, they should pay attention to three points: first, the high light part, second, the low light part, and third, the transition part. Because the particles of lens glass material are much higher than pixels, the main reason for clarity is the analysis of light by photoreceptor. Accurate exposure, uniform distribution of all kinds of light and light, and small particles (meet the needs); If the exposure is not accurate, you should not step, otherwise it is the quality problem of the photoreceptor.

Fifth, the use of digital photos. Now digital photos are rarely printed in the form of traditional photos. More than 90% of the photos are placed in computers or electronic photo albums. Due to the need of work, some photos may be used as billboards, brochures and product advertising brochures, and few people do large-scale advertisements. Suppose it is for general household use. Ten years ago, I began to make my digital photos into electronic photo albums with pictures and sounds. With the development of audio-visual technology, problems have gradually emerged. The original photo taken by Nikon with 3 million pixels cannot be moved (partially enlarged); Later, the 8-megapixel photo of Canon 350D could not be enlarged below 1/2; The12 million photos of Nikon D700 are allowed to be enlarged 1/4. At the same time,160,000 pixels of Sony's micro-single is obviously not as good as14 of Nikon's. So we must not just pursue the higher the pixel, the better.

Sixth, the presentation of digital photos. Using digital photos to make a large publishing board, we will not enlarge a photo to the whole canvas, but only use part of it. So high pixels are very important.

Pixels are of course very important in making brochures. But whether it is used or not lies not in the quality of the photos, but in the importance of the photos. This is the difference between editing and photography. So if it's an A4 format manual, 2 or 3M photos will be enough. Because, we don't make high-quality picture books, just for publicity.

Watch it on the computer. The computer screen has gone from 800*600 to 20 inches and 24 million pixels now. It's totally two concepts, and the enlargement of the picture is not consistent with the performance pixels of the screen. To be sure, the bigger the screen, the more distant it needs to be viewed. So 8 million pixels is enough for our general-purpose photos. Because the replication equipment has been repaired for you. Does every photo need to be enlarged?

Make DVD electronic photo album. Part of it was mentioned earlier. In addition, the video design standard of DVD is 720*576. No matter how clear you want to be, the current high-definition video recording equipment will reach the high-definition standard, but only when the existing video recording equipment plays on the high-definition equipment can the high-definition effect be achieved. Otherwise, it's just half the effort.

A little experience, no summary, welcome to pat the brick.