You can reapply the 
		Input Color Space Rules to reset the 
		Color Space used by existing 
		File textures and other image inputs in the scene. This can be useful if you have changed the rules, or if you are applying color management to existing scenes that did not previously use it. 
	 
- If there are any image nodes whose color space you do not want changed by the rules, make sure that 
		  Ignore Color Space Input Rules has been activated in their attributes. 
		
 
- In your 
		  Color Management preferences, make sure that the 
		  Input Color Space Rules are set as desired. See 
		  Define rules to assign color spaces for input files. 
		
 
- Click 
		  Reapply Rules to Scene.