In simplest terms, post processing is similar to adding filters to your images to make it more impressive. However, in Unity these can affect the whole scene or a portion of your scene.
To use, post processing, let’s create an empty GameObject and name it Post Process Volume. Then, add the Post-process Volume component. Tick Is Global and click the New button to add a new Post-process Profile. Basically, this means is that whatever effects we add affects the whole scene.
Adding effects will not make a difference just yet. You will need to change the Layer to Post Processing. If it does not exist just yet, simply add it by Selecting Layer->Add Layer… and add Post Processing.
Now that the layer is added, go back to the Post Process Volume GameObject and set the Layer to Post Processing.
Next, Go to the Main Camera and Add a Post-process Layer component. Under Layer, select Post Processing.
Now, you can add effects to Post Process Volume and visualize the changes. As as example, we can add Vignette so that the Player’s eyes will focus more on the center of the screen. On Post Process Volume, select Add effect…->Unity->Vignette. Tick all the boxes in Vignette and increase Intensity to see the difference.
Here’s an example of using Bloom to add a greenish glow.
You can use Color Grading, which is normally used in film to set the scene location or if timeline is set to the past, present or future.
At this point, it’s really up to you to experiment on other Post-processing effects.
