UI Textures look washed out in WebGL build

I created a WebGL build a couple of days ago and when I ran it I noticed some of the UI textures look very washed out. In the image below you can see how the colors in the WebGL build look very washed out compared to the PC build. The problem is most evident with UI textures, but as you can see, the terrain behind the image is also washed out in the WebGL build.



My Unity version is 2019.2.5f1. This is an older texture and is displayed in the OnGUI method of a MonoBehaviour script, i.e. not in Canvas, like this:

Code (CSharp):

1. private void OnGUI ()
2. {
3.     GUI.BeginGroup (new Rect (PositionX, PositionY, SizeX, SizeY), MyTexture);
4.     GUI.EndGroup ();
5. }

The problem above does not happen for textures displayed in Canvas, just for ones in an OnGUI method.

Here are the import settings for the texture in question:



And below are the WebGL Player settings:


This happens on Chrome and Edge browsers. What could be the problem?

 

In case somebody is curious, I resolved the issue above by setting the Color Space to Gamma.