In graphic design, a drop shadow is a visual effect consisting of drawing that looks like the shadow of an object, giving the impression that the object is raised above the objects behind it. The drop shadow is often used for elements of a graphical user interface such as windows or menus, and for simple text. The text label for icons on desktops in many desktop environments has a drop shadow, as this effect effectively distinguishes the text from any colored background it may be in front of.
A simple way of drawing a drop shadow of a rectangular object is to draw a gray or black area underneath and offset from the object. In general, a drop shadow is a copy in black or gray of the object, drawn in a slightly different position.
How to Create Shading:
The first step of creating the shading is to determine the angle or the direction of focusing on it. It has to be created in the opposite side to the light source. So, it’s important to identify the light source as well. The sense perception of the graphic designer is very important in this regard. An experienced graphic designer can create the best shading effect.
The next step is to cut out the image from its original background and to put it on a transparent background. Then you have to take two more layers under the layer of the subject. The lower layer should be pure white and the upper one is the desired layer for creating the hollow man effect.
Now, create a clipping path layer and draw the shape of the shading with Photoshop pen tool. Then, select the path, apply necessary feather (it depends on the resolution of the image) and make the selection area black. Don’t forget to add necessary blur to the black layer. The next step is to touch up the shadow dimension to give the best shape. Finally adjust the opacity according to the requirement. It can be 40% or 50% or 60% or anything that will make the shadow most realistic.