maelstrom
Click on the image once, then you can use CTRL and SHIFT to zoom in and out, and the arrow keys to move around.
If you are on an Apple device, drag your finger on the image to pan around. Pinch/unpinch on the image to zoom in and out.
It's a little more centered than I normally like. But, this is where I ended up. Not sure if I'm happy with this one or not. What do you think?