How many pixels is a normal film equivalent to?

Theoretically, to achieve the same effect as the photos taken by the traditional optical film camera, at least one digital camera with 6,543.8+0.6 million pixels is needed (as far as I know, only the highest-end digital camera of Canon with Quan Huafu's advanced CMOS sensor can reach 6,543.8+0.67 million pixels). However, as a digital camera, printing 5-inch photos or 6-inch photos with 3 million pixels is very effective, printing 7-inch photos with 4 million pixels is very delicate, printing 10-inch photos with 5 million pixels is no problem, and printing 12-inch photos with 6 million pixels is basically comparable to traditional cameras, and so on. That is to say, compared with the traditional camera, the photos taken by a digital camera with a certain pixel are no different from those taken by the naked eye in small photos, and only by zooming in to a certain size can we see the obvious difference. In fact, many effects that cannot be achieved on film cameras are easily achieved by digital cameras. I think this is also an important reason for the rapid popularization of digital cameras. Traditional film is actually sensitized by silver halide particles, and each silver halide particle is actually a pixel. The imaging of digital cameras mainly depends on CCD or CMOS, and each pixel of CCD or CMOS is composed of thousands of Qian Qian molecules.

From another point of view, the imaging quality of traditional cameras is mainly controlled by the lens, while the imaging quality of digital cameras is mainly controlled by the number of pixels of CCD or CMOS. The resolution of traditional film has far exceeded the limit of lens resolution, but CCD or CMOS still needs a long effort.

If the photosensitive area of CCD or CMOS of digital camera is as large as that of traditional film, and each pixel of CCD or CMOS consists of n molecules, then the pixel number of film is roughly equivalent to n times that of CCD or CMOS with the same area.

Therefore, the number of pixels of digital cameras is not comparable to that of traditional films.

In addition, the so-called "pixel" ("resolution" or "grain") of film generally depends on two factors. First, the quality of the film itself, such as the Le Kai film 20 years ago, is different from the Le Kai film now. Of course, Le Kai movies are higher than the "pixels" 20 years ago. Second, the "resolution" of the camera lens, using the same negative (such as a movie) to shoot a building (such as the National Culture Palace) and using Leica lens to enlarge it to 20 inches. The "pixel" of the film shot by the ordinary camera lens is 2 million, while the "pixel" of the film shot by Leica lens is100000.