Can I save the tone mapped result in JPEG format?
Yes. However, saving the tone mapped image in JPEG format is not advisable. Here is why: FDRTools is not (and does not want to be) a full fledged image editing application. Things like retouching, sharpening, resizing etc. are not implemented in FDRTools. Therefore, the resulting image should be saved in a lossless format like TIFF. so that you have best possible quality available in your favourite image editing application.