Canon MF6180dw Manual page 495

PDF (Compact) Image Level
Select the image level when PDF (Compact) is selected as the file format.
1
Press [ ] (Menu).
2
Select <Scan Settings> using [ ] or [ ] and press [OK].
3
Select <Output File Image Settings> using [ ] or [ ] and press [OK].
4
Select <PDF (Compact) Image Level> using [ ] or [ ] and press [OK].
5
Select the set mode using [ ] or [ ] and press [OK].
6
Select image level using [ ] or [ ] and press [OK].