How does PS remove the scanned points?

If you choose a beautiful magazine, there will be fewer moire fringes, and post-processing is needed to remove moire fringes, such as changing the color mode to CMYK, and then using filter-Gaussian blur in each color channel. Generally speaking, there are no ripples in the black channel (K), and the most ripples appear in the magenta (M) and yellow (Y) channels.