There are some neat detection bypass / compromise methods using various image formats, including PNG [0] and SVG [1]!

I imagine that folks like journalists could have that type of attack in their threat model, and EFF already do a lot of great stuff in this space :)

0. https://isc.sans.edu/diary/31998

1. https://www.cloudflare.com/cloudforce-one/research/svgs-the-...