tree ea2a54f7c2b3cc556a9b920740fa9d6395b7aa29
parent d13544da46100e0f1247ae31ada1c97b1001a70d
author Marc Kupietz <kupietz@ids-mannheim.de> 1784281627 +0200
committer Marc Kupietz <kupietz@ids-mannheim.de> 1784281979 +0200

Add fabric print variant with black replaced by dark grey

When printing on light fabric, solid black bleeds out, making QR codes
hard to scan and text fuzzy. ci/pdf-lighten-black rewrites all vector
pure black in a finished PDF to a dark grey (default 15%, configurable)
via a qpdf QDF round-trip: text and vector graphics stay vector and
embedded raster images are untouched. The CI now additionally produces
target/skeleton_fabric.pdf.

Ported from the DeLiKo@DNB poster project.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Change-Id: I594a1a813284e8d4f9d6c3a97f0d3d56c36162a6