Bob I am not sure what Rexoids is actually asking..

Rexoids - once you load a jpg into an editor such as InDesign or Photoshop, then yes you can edit out the background because whilst it is held in the editor program although it is named as a jpg type, it is not the actual jpg you are ediiting. You are editing a working image in memory.

You can then save/export that image in a file format that supports transparency, such as png - but if you save it as jpg you will loose the transparency, because a jpg file does not support it [cannot do it]