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0 pointskevin_thibedeau9mo ago0 comments

Print single-sided. Otherwise there's a risk that nominally invisible bleed through from the other side can be enhanced. It's better to just convert a PDF to images directly and redact that.

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mjevans9mo ago

That is the EXACT process I automated the non-redacting parts of using cron jobs and task folders at a past job.

Flatten everything to a set of just images.

Have normal human staff draw black boxes over anything to be redacted.

Compose a new 'PDF' that's a set of 'scanned' images.

nkrisc9mo ago

I wonder if using certain kinds of inks could cause slight differences in reflectivity over the redacted text, leaving artifacts that could be used to reconstruct the text in scanned documents? Seems like applying strips of opaque tape over the redacted text might be the most certain method, though maybe overkill after all.

3eb7988a16639mo ago

This was sort-of the winning solution to an underhanded C contest to redact an image. Hazily remembered, but the winner used a trick where already black pixels got redacted to one color black and already white pixels got to an ever so slightly different black. Reversing the image would then make it trivial to read the original black-on-white text.

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