For PDFs that overlay invisible OCR text on scanned images, a procedure and verification method for unifying page sizes and making JBIG2 images printable (converting to CCITT G4) without breaking the invisible text — using pikepdf and pypdf instead of Ghostscript. Includes the polarity (black/white inversion) pitfall.
Steps to move a GitHub Pages custom domain to a different domain and redirect old URLs to the new one while preserving the path. Covers handling the PWA Service Worker and the domain-verification caveats for resolving 'domain is already taken'.
A record of generating sample CAD data (STEP/STL) with the OSS build123d, ingesting it into Archivematica, and confirming PRONOM format identification (fmt/698 and others) in the AIP's METS and the behavior of the default FPR.
DH Weekly Topics — 2026年6月28日週
How to record how-to demo videos of a macOS native (SwiftUI) app for digital archives (semi-)automatically. I fully automate the CLI with vhs, and for the GUI I build a self-driving demo mode into the app itself, record per-window with screencapture, and cover narration/subtitle synchronization plus splitting into parts and reassembling them.
A record of running Sleuth Kit (fls/icat/fiwalk/tsk_recover/mmls) and Brunnhilde on macOS against a FAT16 test image, to see how recovering deleted files and analyzing a disk image differs from simply copying a folder.
A record of installing Brunnhilde — which characterizes sets of born-digital / digitized files — on macOS (Apple Silicon), through to producing a PRONOM format-identification report via Siegfried.
A record of verifying ClamAV — used in a digital archive SIP-creation workflow — on macOS (Apple Silicon), where an EICAR test file vanished the moment it reached the disk, and isolating the cause. It turned out to be the on-access scan of resident antivirus, not XProtect.
DH Weekly Topics — 2026年6月21日週
A record of implementing a native macOS app that builds SIPs from born-digital/digitized files in Swift instead of the upstream (BitCurator/Linux) tool, then signing, notarizing, and publishing it.
DH Weekly Topics — 2026年6月14日週
DH Weekly Topics — 2026年6月7日週
DH Weekly Topics — 2026年5月31日週
DH Weekly Topics — 2026年5月24日週
DH Weekly Topics — 2026年5月17日週
DH Weekly Topics — 2026年5月10日週
DH Weekly Topics — 2026年4月19日週
DH Weekly Topics — 2026年4月12日週
DH Weekly Topics — 2026年4月5日週
DH Weekly Topics — 2026年3月28日週
DH Weekly Topics — 2026年3月21日週
DH Weekly Topics — 2026年2月22日週