how to modify post processing via sceript in unity code example

Example 1: how to edit postprocessing through script

using UnityEngine.Rendering;
using UnityEngine.Rendering.Universal;
 
var volume = target.GetComponent<Volume>();

if (volume.profile.TryGet<Bloom>(out var bloom))
{
    bloom.intensity.overrideState = true;
    bloom.intensity.value = 2f;
}

Example 2: urp set postprocessing value

UnityEngine.Rendering.VolumeProfile volumeProfile = GetComponent<UnityEngine.Rendering.Volume>()?.profile;
if(!volumeProfile) throw new System.NullReferenceException(nameof(UnityEngine.Rendering.VolumeProfile));
 
// You can leave this variable out of your function, so you can reuse it throughout your class.
UnityEngine.Rendering.Universal.Vignette vignette;
 
if(!volumeProfile.TryGet(out vignette)) throw new System.NullReferenceException(nameof(vignette));
 
vignette.intensity.Override(0.5f);