9-2 Clone Stamp Tool

http://www.missyuan.com/thread-350813-1-1.html 〖s/shift S〗 defines a sample point by holding down ALT and clicking in the image one place
The sample point itself is a property with no layer, and it has only the coordinate attribute, which layer the coordinate is sampled on, it depends on which layer is selected.
It is important to note that, in addition to defining the location of the sample points when copying across images, you must also see whether the correct layer is selected (if multiple layers exist). Otherwise, there is a possibility that an inability to replicate or an error copy occurs.
pattern Stamp tool

9-2 Clone Stamp Tool