Canon MG8100 series On-Screen Manual page 571

Film may not be scanned correctly when Film Type in the Scan Settings dialog box is set to
Auto. In that case, select the type of film in Film Type and scan again.
Note
To scan black and white film, it is recommended that you select Black and White Negative Film
or Black and White Positive Film for Film Type in the Scan Settings dialog box.
5.
Click Scan.
Preview scan starts.
When preview scan of the film is completed, the preview images appear.
Note
Preview images do not appear when the Preview before scanning checkbox is not selected in
the Scan Settings dialog box. The scanned images appear directly in the Thumbnail window.
If film cannot be scanned correctly, see "
"Troubleshooting."
6.
Select the checkboxes of the frames you want to scan, then click Scan.
Starts scanning.
Problems with Scanning/Printing Film
" in