- Insert a picture.
- Go to ribbon to Format tab (make sure you selected a picture).
- Click Compress Pictures.
- New window pops out. You can compress your images here.
- Disable Apply only to this picture option you compress all images.
- Enable Delete cropped areas of pictures to get rid of cropped parts from the presentation.
- Choose the lowest Target output.
Tip: Don’t descrease Target output when you will show your presentation on huge screen.