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🆕 blog! “Removing "/Subtype /Watermark" images from a PDF using Linux”
Problem: I've received a PDF which has a large "watermark" obscuring every page.
Investigating: Opening the PDF in LibreOffice Draw allowed me to see that the watermark was a separate image floating above the others.
Manual Solution: Hit page down, select image, delete, repeat 500 times. …
👀 Read more: https://shkspr.mobi/blog/2026/01/removing-subtype-watermark-images-from-a-pdf-using-linux/
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#LLM #pdf #python -
🆕 blog! “Removing "/Subtype /Watermark" images from a PDF using Linux”
Problem: I've received a PDF which has a large "watermark" obscuring every page.
Investigating: Opening the PDF in LibreOffice Draw allowed me to see that the watermark was a separate image floating above the others.
Manual Solution: Hit page down, select image, delete, repeat 500 times. …
👀 Read more: https://shkspr.mobi/blog/2026/01/removing-subtype-watermark-images-from-a-pdf-using-linux/
⸻
#LLM #pdf #python@Edent Replacing the content with whitespace works just as well without having to fix up the /Length.
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🆕 blog! “Removing "/Subtype /Watermark" images from a PDF using Linux”
Problem: I've received a PDF which has a large "watermark" obscuring every page.
Investigating: Opening the PDF in LibreOffice Draw allowed me to see that the watermark was a separate image floating above the others.
Manual Solution: Hit page down, select image, delete, repeat 500 times. …
👀 Read more: https://shkspr.mobi/blog/2026/01/removing-subtype-watermark-images-from-a-pdf-using-linux/
⸻
#LLM #pdf #python@Edent Hi! The watermarks are everything from /Artifact (this is actually the first argument to the BMC operator) to EMC. They don't have a length, but once you remove them you have to fix up the /Length on the enclosing content stream. However! Since you decompressed the stream, you can just set the /Length to 0, and any PDF viewer can figure it out.
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🆕 blog! “Removing "/Subtype /Watermark" images from a PDF using Linux”
Problem: I've received a PDF which has a large "watermark" obscuring every page.
Investigating: Opening the PDF in LibreOffice Draw allowed me to see that the watermark was a separate image floating above the others.
Manual Solution: Hit page down, select image, delete, repeat 500 times. …
👀 Read more: https://shkspr.mobi/blog/2026/01/removing-subtype-watermark-images-from-a-pdf-using-linux/
⸻
#LLM #pdf #python@Edent given you have vibe coded a scriopt to remove the watermark can we also assume that the 'large watermark' is there to tell everyone that the contents of the pdf were originally generated by an LLM?
If so can't have viewers seeing that can we? -
@Edent given you have vibe coded a scriopt to remove the watermark can we also assume that the 'large watermark' is there to tell everyone that the contents of the pdf were originally generated by an LLM?
If so can't have viewers seeing that can we?@marjolica eh? I've no idea what you're talking about.
It was a pre-print book with a publisher's watermark. -
@Edent Hi! The watermarks are everything from /Artifact (this is actually the first argument to the BMC operator) to EMC. They don't have a length, but once you remove them you have to fix up the /Length on the enclosing content stream. However! Since you decompressed the stream, you can just set the /Length to 0, and any PDF viewer can figure it out.
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@stefano also, for convenience, the overview page:
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@mullvadnet Great writeup, raising awareness on this is very important. Mullvad reporting thoroughly on this topic, I appreciate it.
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Ho rivisto Ferngully. 🌺🌿
Che bello che è, che bella che era la sensibilità ambientalista degli anni '90.
Che bello essere cresciuta con un immaginario e una scala di valori che tuttora definisce il mio nucleo.
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@grumpygamer too late, Peter Molyneux did it.
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@mcc @grumpygamer it feels like it has a lot in common with games about piles of sticks (building them, disassembling them, etc)
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@mcc @grumpygamer damn this is an extremely interesting mathematical question. What is the expected mean number of dies when the process stops?
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@mcc @grumpygamer@mastodon.gamedev.place
sounds a lot like the legendary fork bomb.
