Well, it took a bit and this is par for the course for me posting to a forum then figuring things out like 45 minutes later... I found a way to navigate to let the Scanner Driver handle the scan, which gives you more options. I found an option that K...
I'm having the exact same problem, running MP Navigator EX under Windows 10, running a CanoScan LiDE 90. I've tried every document type and every setting. I can adjust brightness settings when I'm scanning Black & White, but not when scanning color; ...