Different header per page/url

I am looking for a way to have different headergraphics (.png file) for each page/url on my website instead of the statis one for the entire site. I was looking at the HTML-option in theme settings to select the correct file. I am searching to build some sort of combined HTML/file name that uses the page name/url:

fi. the header on “http://www.website.com/page1/” would then use “page1.png” as header.

In the theme settings I would then need some HTML-code like below. I am no HTML expert but just looking for a solution for this.

Hopefully someone can lead me into the right direction or even has the solution.

thanks anyway for any suggestions,
Martin