How does the action in ps turn the pure white background into a strong historical color?
The color picker selects the color to fill the background. Search for a piece of paper with strong paper texture on the Internet, add it to the background, and then realize the filter >; Sketch > post-it notes, and then create a new fill or adjust the layer color level 1. Enter the value "2131.00.255" ctrl+alt+g to create a clipping mask. Adjust the layer 2 blending mode to 50% bright and opaque.