Gutterpress 0.11.15: DriveThruRPG-ready interiors

Released 2026-10-07.

Two fixes for books printed through DriveThruRPG, both on by default for the dtrpg preset.

Black text on the black plate

Chromium writes text colour as RGB, so the PDF/X conversion turned black text into four-colour black, which DriveThruRPG rejects for text at 24pt and below. The new pdfx.blackText option (icc or k-only) controls this. The dtrpg preset uses k-only, which prints black and near-black text, warm inks such as #1a1512 included, at 100% K. Coloured text, and black rules and panels, are unchanged.

A blank last page, every time

The dtrpg preset now pads to 4-page signatures, and the new print.reserveLastPage option adds a full signature of blank pages when the content already fills one exactly, so the final page, which is reserved for printer information, is always blank. The page count in the build log is the number to enter in DriveThruRPG's cover Template Generator.

Existing books build differently

Rebuilding an unchanged dtrpg book gives a PDF with 1–4 extra blank pages at the end and, for --format pdfx, black text on the black plate only. To keep the old output, set this in manifest.yaml:

print:
  reserveLastPage: false
pdfx:
  blackText: icc

See the full changelog or download the release.