Button color always gets brighter than it should. This is my current setup:
This is the resulting color:
I have a title bar that just uses the image component with the same color (no button component) and it shows the correct color.
Is this a known issue?
Just a thought, does this button “start selected” ?? 
Good point, I have no idea, neither on how can I check that.
BTW, this does not happen on Android (including while in the editor) I might be thinking its something Linear/Gamma space related?
lol, you have to manually set it so I’m guessing that’s not the issue then 
one other quick question, are you on Linux??
Thanks for the quick reply. Not on Linux. Windows 10 Pro 64bit.
hmmmm… that IS interesting. I’ll keep digging around but if you wouldn’t mind submitting a bug, I would really appreciate it
I will of course! Thanks again. BTW nothing is selected on “First Selected” so I guess it’s not that.
thank YOU if you post the bug case # here I can add it to my list to watch
There you go: (Case 739653) Button color not displaying correct colors
BTW, I checked your website and saw you wrote an article regarding the automatic layouts, I’ve also found some bugs regarding it, but I’ll come back to that one later 
Cheers and thanks again.
FYI I got this email today, regression, already reported: Unity Issue Tracker - With Linear Space rendering button color is lighter in playmode than in button component
@artur-leao You should check that issuetracker link again 
and thank one Mr. @karl_jones (aka Batman) (^.^)/