Topic on Talk:The Invincible
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Special K correctly lists both Far Cry and HL2 Lost Coast as using 8-bit rendering. And in my experience, it will show a game with togglable HDR support is using 8-bit or 10/12/etc.-bit rendering based on whether the game is actually running in HDR mode.
I'm sorry, but it sounds like your tools aren't correctly displaying the game's behavior.