Photsohop's simple stroke shadow effect can produce effects with proper processing. I hope it can give some inspiration to friends who play Photoshop. In fact, the effect lies in a very simple combination of applications.
Open the image you want to process.

Click the Rectangular Marquee Tool

Draw a rectangular frame on the picture

Select Copy under the Edit menu

Click in the middle of the layer window to create a new window

Select Paste from the Edit menu

The pasted content appears in the newly created layer

Select Stroke from the Edit menu

The stroke dialog box appears, defined as 1 pixel, and the color is black. Of course, you can set it according to your preference. The tutorial is to die for. What you really need to master is the method and drawing inferences from one example.

A stroke effect appears in the area just selected in the image.

Right-click on the new layer with the stroke effect and select the blending option from the pop-up menu.

In the pop-up layer style dialog box, select the drop shadow effect

Look at the final projection effect

Repeat the above steps to practice, the effect is as follows. Of course, the effect will be better if you make it into shapes such as arrows. Here is just a simple description of how to do it. The details are up to everyone. .
