Texture Import Settings

ProjectMenuUtil.cs

using UnityEngine;
using UnityEditor;

public static class ProjectMenuUtil
{
  [MenuItem ("Assets/Import For PixelWave")]
  public static void ImportForWave()
  {
    foreach(Object o in Selection.objects)
    {
      if(o is Texture2D)
      {
        string path = AssetDatabase.GetAssetPath(o);
        TextureImporter importer = AssetImporter.GetAtPath(path) as TextureImporter;
        importer.filterMode = FilterMode.Point;
        importer.isReadable = true;
        importer.textureType = TextureImporterType.Advanced;
        importer.mipmapEnabled = false;
        importer.textureFormat = TextureImporterFormat.AutomaticTruecolor;
        importer.spriteImportMode = SpriteImportMode.None;
        importer.SaveAndReimport();
      }
    }
  }

  [MenuItem ("Assets/Import For UI")]
  public static void ImportForUI()
  {
    foreach(Object o in Selection.objects)
    {
      if(o is Texture2D)
      {
        string path = AssetDatabase.GetAssetPath(o);
        TextureImporter importer = AssetImporter.GetAtPath(path) as TextureImporter;
        importer.filterMode = FilterMode.Point;
        importer.textureType = TextureImporterType.Advanced;
        importer.mipmapEnabled = false;
        importer.textureFormat = TextureImporterFormat.AutomaticTruecolor;
        importer.SaveAndReimport();
      }
    }
  }
}