Crop a conversion while preserving the original

[gtlitc]

Hi There,

Is it possible to crop a conversion while preserving the original?

My users upload their image and the initial conversion is done via the registerMediaConversions method on my model. I now have an edit image page where users can crop an image (cropper.js) which passes coordinates and dimensions to a controller. What I want to do is to overwrite the initial conversion with this new manually cropped version.

I have tried very hard to understand how to do this prior to posting here. I am starting to think I am missing something fundamental and maybe what I am trying to do is not possible. Any help/direction very much appreciated.

Thanks,
:+)