PDF/X-4 from LuaLaTeX without Ghostscript: TrimBox, BleedBox, FOGRA39, and the pdfx package
Producing a PDF/X-4 press-ready file from LuaLaTeX without touching Ghostscript: the pdfx package, TrimBox/BleedBox geometry in points, FOGRA39 OutputIntent, CMYK-only color discipline, and XMP metadata - everything a print shop will verify.
