printMarkOffset

Distance from the trim to the nearest edge of any printer's mark, in design units. Every mark type shares it, so it is comparable with the page bleed without converting. A negative value falls back to the equivalent of 6 pt. Zero is a real offset that places a mark on the trim edge. A mark may reach into the bleed, which the knife removes anyway, and every mark carries a white knockout underneath so it stays legible over artwork. Only used when exportPdfWithCropMarks or exportPdfWithRegistrationMarks is true.