Please also advise me whether to select Letterbox, or Crop And Zoom, or Stretch option when exporting. My photo essay is to be projected from a 1920x1080 photo club computer > projector system, when individual files were file-sized by me to only 720x1080 pixels (= 2:3, vertical ratio) or only 1620x1080 pixels (= 3:2, horizontal ratio) for such projection from the larger 1920x1080 projection capability, without stretching or compressing the individual images unnaturally in one direction or another.
Thank you very much for help in that!
Andy.