Unity Convert Mouse Position

using System;
using UnityEngine;

public class GetMousePos : MonoBehaviour
{
    // the raw image that's rendering your game
    [SerializeField] private RectTransform rawImageRT;

    // the canvas that's rendering your raw image
    [SerializeField] private Canvas canvas;

    // the width/height of your render texture
    [SerializeField] private int renderWidth, renderHeight;

    private RectTransform _canvasRT;

    private float _canvasWidth, _canvasHeight, _scale, _rawImageBottomLeftX, _rawImageBottomLeftY;

    private Rect _canvasRect, _rtRect;

    // access the position through this variable
    [NonSerialized] public Vector3 pos;

    private void Awake()
    {
        _canvasRT = canvas.GetComponent<RectTransform>();
    }

    private void Update()
    {
        _canvasRect = _canvasRT.rect;
        _rtRect = rawImageRT.rect;

        _scale = renderWidth / _rtRect.width;

        _canvasWidth = _canvasRect.width * _scale;
        _canvasHeight = _canvasRect.height * _scale;


        _rawImageBottomLeftX = (_canvasWidth / 2.0f) - renderWidth - (_rtRect.xMin * _scale);
        _rawImageBottomLeftY = (_canvasHeight / 2.0f) - renderHeight - (_rtRect.yMin * _scale);


        pos = Input.mousePosition;
        pos.x = (pos.x / Screen.width * _canvasWidth) - _rawImageBottomLeftX;
        pos.y = (pos.y / Screen.height * _canvasHeight) - _rawImageBottomLeftY;
    }
}