Premiere does not make it easy to do pan/scan on large (8 MP) still pics like Photoshop Elements, which would be an ideal situation, except Photoshop Elements exports only a highly compressed .wmv file.
I automate the pics to the timeline, select one and scale it to 30%, then Copy that, select the rest of the pics and Paste Attributes. Only then can one see the bounding box to do pan/scan.
Make sure “Default scale to frame size” (Preferences>General) is turned off prior to importing images or your pics will look like crap after doing pan/scan.
If you do many picture projects ProShow Producer is the cats meow.
https://www.video2stream.com