6. The Tools in the Toolbox / 6.3 Tools for Image Layers
The Patch Tool works in the same way as the Healing Brush (chapter 6.3.14). They differ only in how the source and target areas are defined.
With the Patch tool, the target area, i.e. the area that is to be changed, is first determined using a selection tool (e.g. one of the lassos). Then the source area is selected by a single click. You can also do this several times to correct the position slightly if necessary.