This is the third time I've gotten complaints about this, as far as I can tell, all from actual non-otherwise-troll people. Apparently there's a small but vocal minority here that find black & white photos inherently "depressing", and insist on content warnings and labels for them.

I don't want to cause anyone needless depression or grief, but I'm afraid I find this expectation unreasonable and unworkable. No one can possibly anticipate every idiosyncratic thing that someone might react to.