Problem with Curves Widget

I’ve been trying to remap the values on HDR maps using the curves widget in the UV window. Problem is, every time I try to save the new image, it converts to .jpg. Is there any way around this?

Set your out put type on the format tab in the render buttons (F10).
I believe that Cineon, OpenExr and Radiance are all HDR formats, but you are probably working with Radience so using that format will probably give you the results you’re looking for.