Steganography

Hello.

I’m attempting the yellow dots challenge but have no clue where to start. I’ve printed out the image, magnifyed it, looked at it through UV light but I couldn’t see anything. However, I did run a tool on it and it did output some yellow dot values. But what can I do with these values? How can I gather information from them?

Thanks.

Hello,

Isn’t printing document prints dots of your printer?
However, I used a tool to search for these points on the original document and it shows nothing.

And here’s what I found on the Internet, dots from some printer, and their explanation

Linked article has some hints on how to find them. Also you can try changing around on the contrast/brightness.