What is the function of stack mode in PHOTOSHOP smart objects? How is it different from the blending mode of layers? Please explain it in common language.

Stacking mode needs to first convert layers into smart objects, which means lossless adjustment can be made.

The mixed mode and stack of layers are all operations on layers, and a new result is obtained according to the algorithm.

Stack mode can handle a large number of layers, and the algorithms are maximum, minimum and average. It is often used to process photos that need long exposure (multiple exposures in the early stage and superposition calculation and synthesis in the later stage), such as the post-processing of stellar orbit shooting, and it is ideal to use superposition mode for processing. But if you want to use the layer blending mode, it is very difficult.

But there are more algorithms in mixed mode. The origin of mixed mode is film darkroom. Those who play with film should understand very well (the whole film is stacked at the bottom = two films are stacked together for development, and color filtering = dealing with underexposed films. . . . The further USM sharpening is also from the film darkroom. This is why photoshop is called a digital darkroom.

Welcome to ask more questions. If you have time, I'd be happy to discuss it with you.