How many pictures does animation usually need to play every second to make people feel smooth changes?

The number of animation frames is generally 24 frames per second.

(2D hand-drawn) Although there are only 8 cartoons per second, or 12 cartoons, and the frequency is as high as 24 cartoons (not counting multi-layers), it still gives most people a smooth impression. I think there are two reasons.

One thing is that the Japanese have greatly exerted the advantages of limited animation. Their original paintings emphasize the key part of the action, which is "the rhythm of the picture" in the words of the animation master Yosiyuki Tomino, and the popular point is to master the "cadence" of the action.

Related information:

The complete animation made by Americans draws the whole process of action by tracing, which is similar to the real shooting. In fact, all the parts of the action are allocated, leaving the key points that the painter wants to express and the parts that he wants to ignore. There is no key point and no feeling of "cadence".

However, the original painting of Japanese animation will enlarge the actions that the artist thinks are the most critical, omitting some intermediate processes, making the picture more jumping, but achieving the function of highlighting key parts, further amplifying the characteristics of animation assumptions and refining content.

Therefore, Japanese animation will look more detached and imaginative, or the "tension" of the picture is also expressed through the refinement of this action. The removed part is "redundant" for the painter, so the picture will not make people feel disobedient, and the boxing picture seems to be more "fist to flesh" than the real fight.