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How to use ps to turn a picture into gray, just like previous photos?
Open a photo with PS and press "ctrl+shift+u" to remove the color. At this time, the image becomes black and white;

Press "ctrl+b" to open the color balance, and turn the photo into yellow as needed, more like an old photo;

Click Image-Adjust-Brightness and Contrast to improve the contrast of the image appropriately.

The final effect is as shown in the figure: