I uploaded an old image of a keyboard PCB from when I was troubleshooting it and it gave a very detailed response including naming the keyboard the PCB comes from, the time of day the photo was likely taken, and where the photo was likely taken.
For jpg: jhead -purejpg, exiftool looks like it only has "remove this specific kind" (like -gps:all= .)
(The more boring use case for this: putting images up on a web page - if you use jhead -autorot to correct the orientation, then the browser sees the metadata and rotates it again...)
