I'm pretty new to thumbor, but i was wondering if, with specific options that I'm unaware of yet, it was possible to "zoom in" an image.
Plain example below :
So far from what I've understood was possible, it could means to resize to a specific area. But I lack of experience on it to find the right options (if this is ever something possible with thumbor)
According to this you should be able to make the image larger and then perform a manual crop on it.
So something like:
http://thumbor-server/PointX1xPointY1:PointX2xPointY2/800X600/http://example.com/upload/koala.jpg