Cracking the ghost font

https://www.mixfont.com/ghost-font claims to be an anti-AI font that can be read by humans but not leading AI models. Like all things though, it can be reversed.

Key insight: this works by moving the noise pixels in the background downwards, while moving noise pixels in the text upwards. You can see the pixels move down in the gif below.
To a human this is easily recognizable (pixels are just moving down!), but to AI looking at single frames it all looks like white noise.

The concept of reversing it is trivial:

• pick 2 different frames in the video and stack them on top of each other
• move the 2nd frame down till the background pixels match the 1st frame exactly (and it'll match, because the pixels are the same)
• add a filter such that if a pixel is black in both frames, it cancels out and it becomes white (basically xor)
• remaining black pixels are the secret text, a noisy section on top (because we moved the 2nd frame down) and a bit of random noise.

Here's a quick proof of concept.

A sample is already loaded below - play with it right away.
To try your own: go to Ghost font, type in some text, download it, drop it here. everything runs locally in your browser, nothing is uploaded