How to change a global gamma?

Dneproman · October 21, 2014, 7:14am

How to change the global settings of gamma in the game. For example we have a slider, we want it to change the parameters of the gamma, how to do it?
Maybe there is a console command, or what?
We can not deal with this
Thanks!

Lovecraft_K · October 22, 2014, 3:56pm

Hey Dneproman -

All you would need to set this up is a Global Post Process volume and add the following Blendable Post Process Material into the volume. Run the Scalar Parameter Value (which I called Gamma_Correction) through a Blueprint control in which you set up a slider to adjust the value in a predetermined range.

Gamma at its simplest form is a power law function meaning the results are a power of the input times a constant (and in its simplest form that constant is 1). We do have a color grading feature in our post process volumes which is a more advanced form of Tone Mapping which can also be used to help adjust Gamma. More on that here, Color Grading and Filmic Tonemapper | Unreal Engine Documentation

Thank You

Eric Ketchum

EDIT: Very sorry in my haste I forgot to post the Image.

Dneproman · October 23, 2014, 5:14am

Hi Eric!
In truth, I did not count on a quick response, thank you so much, this is what i need!
Many thanks!

anonymous_user_fd57f212 · February 17, 2015, 8:35pm

I implemented a Gamaoption this way, inside the editor it works as intended (4.6.1), also “standalone play” works fine. However if the project is packaged the option just has no effect at all.

Lovecraft_K · February 18, 2015, 3:56pm

Hey AlexW88 -

Can you be more specific as to how you are changing the Gamma_Correction Option at runtime? Is it a part of your level blueprint, character blueprint? A specificly created actor blueprint? As much information as you can would be helpful.

Thank You

Eric Ketchum

anonymous_user_fd57f212 · February 19, 2015, 9:37pm

Hi Eric,

thank you for your quick response, and also for providing this guide. I’m changing it through set scalar parameter within a widget blueprint.

Apparently it seems like there was some issue with the packaging. I packed it a few more times, and after like the 4th time the function started out of sudden to work (without any change to related code or assets) and keeps working nicely till now.

Lovecraft_K · February 20, 2015, 3:41pm

What are you packaging for? Mobile does not currently support the Post Process Blendables yet.

Thank You
Eric Ketchum

anonymous_user_81fb15a7 · March 25, 2015, 6:01pm

Hello!

This is a fantastic solution, but I am getting no anti-aliasing when I implement this method. Please see post here:

any help is greatly appreciated!

Loxli · April 27, 2015, 2:17pm

cmd: gamma 0-10

anonymous_user_f3fb80e6 · August 8, 2015, 3:35pm

This works well, should be the favorite answer here!

Cobryis · January 5, 2016, 11:30pm

gamma is clamped by the engine between .5 and 5.0. The default value is 2.2.

Jambax · November 16, 2017, 12:34pm

Updated this as the accepted answer. Command Line is arguably a preferable alternative to creating an asset!