Starting post processing
To start working with post processing in Unity is simple, go into the package manager (window — package manager), choose Unity packages in the packages dropdown menu, and hit install.
Once the package has been installed, return to your hierarchy and create a new empty game object, and add the “Post-process Volume” component.
Before we can see any post processing effects however, we need to add a “Post-process Layer” component to the camera.
Next we need to create a post-processing layer in the Layer settings, accessed through the layer dropdown menu at the top of the inspector, click add layer and fill out one of the empty slots with the name of your post processing layer.
Set your post process volume game object’s layer to your post processing layer.
Set the layer setting in the post process layer component on the came to the post processing layer.
Now you’re ready to add a world of effects to your game by clicking add effect on the post process volume and choosing from the dropdown menu.
Here I have aimed for turning my space arcade shooter into a Mexican space arcade shooter by using color grading to add an orange tint.