deda_anonmask_create

deda_anonmask_create -w [options]deda_anonmask_create -r file [options]

deda_anonmask_create is the first half of DEDA's print anonymisation. -w writes testpage.pdf. Print that file with no page margin, scan the printout at about 300 dpi in a lossless format, and pass the scan to -r. The command writes mask.json, which deda_anonmask_apply stamps onto later PDFs before they are printed.One of -w or -r is required. --copy makes the mask reproduce the dots the printer already prints, rather than a pattern meant to hide them.

-w, --write

Write a calibration PDF to testpage.pdf in the working directory. Mutually exclusive with -r.

Read a scan of a printed calibration page and write mask.json. Mutually exclusive with -w.

Store the printer's own dot pattern in the mask instead of an anonymising pattern. Used with -r.

Repeat to print more diagnostic detail.

-w always writes testpage.pdf, and -r always writes mask.json, both in the current directory. Existing files at those names are overwritten.The scan has to show the calibration dots. Margin scaling, a lossy format, or a driver that drops the yellow channel produces a mask that will not line up. --copy is a different operation from anonymisation: the printed page still carries a readable pattern.

deda_anonmask_create is part of DEDA, written by Timo Richter and Stephan Escher and described in their 2018 paper on forensic analysis and anonymisation of printed documents.

deda_anonmask_apply(1), deda_parse_print(1), deda_create_dots(1), deda_clean_document(1)

Source code