I have the same problem. I am using Simple Scan 3.28.0 with a Canon PIXMA 2522 printer/scanner. The lighter/darker and contrast sliders do nothing. Printing is fine.
I have swapped the PIXMA with a Canon LIDE60 flatbed scanner and the sliders work perfectly.I have also downloaded ScanGear from Canon and the lighter/darker/contrast sliders work fine with the PIXMA 2522 but I'd rather be using Simple Scan. I'm using Mint 19.2 Tina w/Cinnamon. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to simple-scan in Ubuntu. https://bugs.launchpad.net/bugs/1327801 Title: Bightness and contrast settings have no effect Status in simple-scan package in Ubuntu: Triaged Bug description: Scanner: Canon, Inc. CanoScan N1240U/LiDE 30 Ubuntu 14.04, Simple Scan version 3.12.1. Adjusting the settings of brightness and contrast has no effect. With the default for scanning in "text" mode being too bright, this makes "Simple Scan" in text mode unusable for me. Brightness and contrast settings don't work in "foto" mode, too. But the default of the foto mode is usable. Brightness setting does work in program "Skanlite". To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/simple-scan/+bug/1327801/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp