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Trari › Computerphile
This week on the channel +368K views this week

Computerphile hides a signature inside a campus photograph

Mike Pound's TrustMark demonstration tests what survives compression, cropping and one wrong-file mistake.

Channel: Computerphile Story of Trari Newsroom

Why this story? The channel's weekly summary: what went up this week, what is drawing views now, and where the channel stands among similar channels.

How Image Watermarking Works - ComputerphileHow Image Watermarking Works - Computerphile

Things we can learn from the video

Press to jump

  1. 0:55Metadata and simple least-significant-bit methods are vulnerable to manipulation and compression.
  2. 6:00An encoder embeds the watermark, while a decoder learns to recover it.
  3. 10:18Simulated cropping, noise and color changes during training make watermark extraction more resilient.
  4. 14:36Pound embeds "computer" in a Jubilee Campus photograph using TrustMark.
  5. 17:34The watermark survives several edits, but extreme cropping prevents recovery.
  6. 23:31An absent watermark cannot prove that an image was not AI-generated.

How much editing can a hidden image watermark survive? Mike Pound puts the question to a photograph of Jubilee Campus, embedding the word "computer" and then trying to recover it after the picture has been altered.

"How Image Watermarking Works - Computerphile" was the channel's only new upload this week, reaching roughly 124,000 views. Pound explains how neural networks can learn to bury information in an image while keeping it recoverable through common edits. Training includes simulated damage, so the system gets practice dealing with the kinds of changes a picture might encounter outside the lab.

The demonstration has a very human interruption: an early detection attempt fails because Pound has edited the original, unwatermarked photograph. "That may be up there in the top five mistakes of all time that I've done on this channel," he says. Viewers are discussing the decision to leave that detour in, alongside a recurring technical question: what happens when you put a watermark on top of another watermark?

With the correct file, the hidden message survives compression, resizing and other alterations before extreme cropping defeats it. Pound also makes an important distinction: finding a watermark can identify a process an image passed through, but not finding one cannot establish that the image wasn't AI-generated.

The upload is currently drawing the most daily views on Computerphile. Julian Onions' "Multiplayer Gaming & Flight Simulation - Computerphile," about keeping networked aircraft synchronized, comes next, while Pound's earlier AI-watermarking deep dive continues to attract views.

Subscribers held steady over the week, and daily viewing is running somewhat below the channel's usual level. Among nearby educational channels, MindYourDecisions is above its typical daily viewing pace. Computerphile's own week, meanwhile, offers a satisfying combination: an invisible signature, a practical stress test and a mistake the edit graciously preserves.

Published on Trari

Where next?

More from ComputerphileThis week on the channel one video this weekMatt Godbolt gives Computerphile's race conditions a human scaleThe week's sole upload connects concurrent computing to everyday situations, with Sean Riley behind the filming and editing.Channel: Computerphile · Story of October 14, 2026 Also in Explainers, history and educationVideo taking off 446x its usual first dayAnneleen Michiels asks what family money arguments are really aboutHer TEDxUHasselt talk makes the case for small financial mistakes and earlier conversations, rather than keeping the peace through silence.Channel: TEDx Talks · Story of November 11, 2026 A different discovery todayVideo taking off 49x its usual first dayWomen in ITV's Power and Silence say David Walliams pursued them as teenagersTwo of the women were 15 when they met him. Walliams denies all wrongdoing, saying in a statement: "I am not a sexual predator".Channel: ITV News · Story of November 11, 2026

What viewers say

  • Sean could have easily cut out the part where Dr. Pound edited the wrong file, but leaving it in was so much funnier.
    @JamieOfHouseTMSee it on YouTube
  • I wonder how double watermarking works. For example, generating with AI and then applying your own.
    @mythofechelonSee it on YouTube
  • Heh, think we've all edited the wrong image/clip at some point or other!
    @gojohnniegogoSee it on YouTube
4 more comments
  • This is fascinating! I expect it's going to be a cat and mouse game, with novel techniques to watermark and novel techniques to get rid of watermarks.
    @silkworm6861See it on YouTube
  • Pound for Pound, this gave me more understanding of watermarking than most other videos.
    @ElvisStansvikSee it on YouTube
  • What happens if you apply a watermark on top of another watermark?
    @nius3774See it on YouTube
  • It'd be great if the code was available for this. I'd love to play around with it.
    @uhertleinSee it on YouTube

Public comments from the video's page on YouTube

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The videos drawing views on Computerphile right now

Multiplayer Gaming & Flight Simulation - Computerphile119,278 views How Watermarks Track AI Generated Content - Computerphile514,139 views
The facts
Subscribers
2,640,000
Channel views, last 7 days
367,946
Videos published this week
1
Video published
October 22, 2026
Video views so far
123,622
Views on its first day
70,763

The numbers

Here is Computerphile's week in views and subscribers.

views gained this week: this channel and similar channels
BradyYourTutor
80,110,017
GeoGlobeTales
11,485,331
Half as Interesting
2,118,632
Economics Explained
1,692,524
Overly Sarcastic Producti…
1,576,215
MindYourDecisions
1,018,472
See U in History / Mythol…
563,085
Technology for Teachers a…
528,465
Computerphile
367,946
subscribers
2,640,000
no significant change in the last 7 days
total views
242,741,520
views per day
33,521
typical day: 39,385
first-day views of each video posted this week
How Image Watermarking Works - Computer…
70,763
subscribers: this channel and similar channels
BradyYourTutor
3,410,000
MindYourDecisions
3,280,000
Half as Interesting
2,950,000
Economics Explained
2,890,000
Computerphile
2,640,000
Overly Sarcastic Producti…
2,570,000
See U in History / Mythol…
2,370,000
GeoGlobeTales
2,060,000
Technology for Teachers a…
1,960,000
As of October 28, 2026 · Data source: Trari Social News, Trari Traffic Trends and Ranking Platform, Google YouTube
Subscriber, view, like and comment counts are YouTube's. Rates, usual days, rankings, comparisons and categories are Trari's own calculations.
Developed with YouTube

💡 Test your knowledge

Which networking protocol features in Julian Onions' flight-simulation explainer?