Public bug reported:

Unity changes the physical brightness of the screen, which is weird,
since human eye perception of brightness is different than the physical
brightness of the object that is perceived. For clarification (and the
reason), the first three paragraphs of this article might help:
https://learnopengl.com/#!Advanced-Lighting/Gamma-Correction

Can we please make Unity consider perceived brightness while changing
it?

Description:    Ubuntu 16.04.1 LTS
Release:        16.04

unity:
  Installed: 7.4.0+16.04.20160906-0ubuntu1
  Candidate: 7.4.0+16.04.20160906-0ubuntu1
  Version table:
 *** 7.4.0+16.04.20160906-0ubuntu1 500
        500 http://ubuntu.mirrors.ovh.net/ftp.ubuntu.com/ubuntu 
xenial-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     7.4.0+16.04.20160415-0ubuntu1 500
        500 http://ubuntu.mirrors.ovh.net/ftp.ubuntu.com/ubuntu xenial/main 
amd64 Packages

** Affects: unity (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: wishlist

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https://bugs.launchpad.net/bugs/1655407

Title:
  make unity consider perceived brightness

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