scanimage doesn't respect options (brightness, contrast, ...) with Canon CanoScan LIDE 35

[Florian Stuhlmann]

Device: Canon CanoScan LIDE 35

Options (--brightness and --contrast) are not respected.

Reproduce the bug:
Scan the same document with

scanimage --brightness=0 > 0.pnm

and

scanimage --brightness=100 > 100.pnm

The result will be the same.

Changing the output format doesn't change anything. Graphical programs (simple-scan 3.36.0, skanlite 2.1.0.1) have the same problem. But with xsane-0.999 it works.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: sane-utils 1.0.29-0ubuntu5
ProcVersionSignature: Ubuntu 5.4.0-18.22-generic 5.4.24
Uname: Linux 5.4.0-18-generic x86_64
ApportVersion: 2.20.11-0ubuntu21
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Sat Mar 21 22:39:23 2020
InstallationDate: Installed on 2020-01-05 (75 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20191230)
SourcePackage: sane-backends
UpgradeStatus: No upgrade log present (probably fresh install)

[Michael Haworth (bailtree-deactivatedaccount)]

I tried this with a Canon CanoScan LIDE 25 but cannot reproduce the issue.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Miguel Barrio Orsikowsky (megamik)]

This bug also affects Canon CanoScan LIDE 60.