Version: (using KDE 4.3.2) OS: Linux Installed from: Ubuntu Packages I wish there was a way to adjust the color temperature in the systemsetting -> screen. We could use the program Redshift (http://jonls.dk/redshift/) for it to be a standard option in KDE.
Kai-Uwe, will color correction in KWin allow the user to change the color temperature?
Together with a colour measurement device it is possible in dispcalGUI's calibration.
Kai-Uwe, this request is not about calibration, but about customization. Redshift is an application that makes the display use warmer or colder colors depending on daytime.
Redshift would be interfering with ICC profile internal vcgt calibrations and thus invalidating the ICC profile characterisation. That interference can cause quite some trouble for users. Typical a dimming of the display backlight is much more effective and recommended, than heavily bending the white point towards warm light through applications like Redshift.
I strongly agree. Dimming is not adequate. Anyone who has not tried Redshift does not understand. Redshift adjusts white-point based on time of day! And it is NOTHING like just brightness. Also, there is a simple plasmoid to adjust everything and works great, instand on/off and override of settings and more! http://kde-apps.org/content/show.php/Redshift+Plasmoid?content=148737 This should be included in the base KDE system. EVERYONE should use this. I avoid using any computer that doesn't have this! Please consider this plasmoid for the system, along with the redshift backend!
Blue light of computer screens can make us blind. (https://www.businessinsider.de/blue-light-from-smartphones-and-laptops-can-make-us-blind-according-to-study-2018-8) Even Windows 10 has a "night mode" in the display settings! It's time for the KDE Plasma Desktop to include this functionality. The first step could be to add an option to manually switch ON or OFF a blue light filter. "redshift" already includes such functionality and much more...
Good to bring this physiological color issue on the table. After more reading on the subject, personally I support the idea since some months. It is good to have. My efforts went into integration of ICC style color management inside the Oyranos project. Here the page for the Oyranos Night Manager for the interested: https://github.com/oyranos-cms/oyranos/projects/2 This implementation will work with old X11, as there are API's easily available. There is a different KWin-Wayland effort, which works only for the white point side without ICC calibration integration or general GPU color transforms.
Related Night Color issues: https://bugs.kde.org/show_bug.cgi?id=390021 https://bugs.kde.org/show_bug.cgi?id=396967
"Since March 2020 Redshift is installed by default on Kubuntu Focus and new users are created with the widget enabled in the panel or the system tray." https://kfocus.org/wf/redshift.html