When sourcing lithographic (offset) printing, you must prioritize color accuracy and image resolution. Ensure the supplier uses CMYK four-color process or Pantone Matching System (PMS) for brand consistency. Technical benchmarks should include a minimum resolution of 300 DPI for source files and the use of high-quality plates (CTP technology) to ensure sharp details. Additionally, verify the paper weight (GSM) and finish options (e.g., aqueous coating, UV varnish, or lamination) to match the durability requirements of your specific application.