Traditional Culture Encyclopedia - Photography major - How does photoshop achieve this facial blur or afterimage effect?

How does photoshop achieve this facial blur or afterimage effect?

1 Open photoshop and drag the image directly to ps.

2 Click the "Polygonal Lasso Tool" to circle the duck, then subtract the selection to keep one duck.

3 Execute "Select"-"Reverse", the shortcut key is ctrl+shift+i.

4 Execute "Filter" - "Blur" - "Motion Blur" and set specific parameters.

Distance 32 pixels