Directly convert between Unity's Color32 and int.

ColorConverter.cs

/*
 * Author: Jim Chan
 * Created Date: 15/04/2024
 */
using System;
using UnityEngine;

public static class ColorConverter
{
    public static Color32 ToColor(int value)
    {
        Span<byte> bytes = stackalloc byte[4];
        BitConverter.TryWriteBytes(bytes, value + 1);
        return new Color32(bytes[0], bytes[1], bytes[2], bytes[3]);
    }
    public static int ToInt(Color32 value)
    {
        ReadOnlySpan<byte> bytes = stackalloc byte[] { value.r, value.g, value.b, value.a };
        return BitConverter.ToInt32(bytes) - 1;
    }
}