The previous “I wrote it, you made it” posts have been examples of people who executed an idea I proposed. But this time I’m writing about people who took one of my ideas to another level altogether.

In September, 2007, I demonstrated how an image can be hidden in the histogram of another image. The example I used was the New York City skyline…

…hidden in the histogram of a simple gradient:

I followed that up by writing about Josh Millard, a reader who figured out how to embed the histogram in a more recognizable picture than just a gradient. He was able to embed the NYC skyline histogram in the original source image of the NYC skyline!

But I never wrote about what Stewart Smith did with this concept. He took the idea in a different direction, wondering if it would be possible to embed an actual word or phrase in the histogram of an image. So he developed Histoface, a web app that allows you to generate a gradient which contains a secret message in the histogram.

So this image…

…has this histogram:

It should be obvious that it says “STARWARS” but unfortunately not all the letters in the typeface are as easy to recognize as these. It’s difficult to create recognizable letters that work in a histogram. But I give Stew major credit for making it this good!

I’d love to see a combination of Stew’s project and Josh’s project, allowing you to type a message and hide it in the histogram of any grayscale image. Who wants to work on that?