That's so weird to me, I have trouble seeing blue & black - looks gold and white to me at all times

I'm still not convinced the white and gold people aren't just trolling.

I want to know what some tetrachromacic people see.

Since the monitors themselves are RGB, I don't think tetrachomats will see anything different.

I was seeing white and gold this morning. Read the reddit post, somebody had done a contrast adjustment showing the black/dark brown and blue and when I saw that, front that point onward I only see blue/brown (still don't see the black, it's a dark brown to me).

The funny thing is, this morning when I first "got it", the blue was very light, and I've been looking at the original tumbler throughout the day and I swear it's getting darker blue every time.

Now I can't even see the white and it's kind of blowing my mind. I remember the WTF moment when people said it was blue/black and only seeing white/gold, but I just can't reverse it and see it again.

I see the blue when I adjust the scale, but can still make out some gold at the top.

right, there's no lighting scenario in which black fabric looks gold.

Objectively the photograph is light blue and brown. It's not even a proper optical illusion, it's just what your assumptions are about lighting and exposure, if you're trying to determine the colors of the actual object from a bad photo.

I guess I understand what you mean. I can see the brown when it's pulled off to the side with a hex code, but in the context of the picture, I would always answer that the (brown) part of the dress is "black."

Making the image smaller/cropped/etc doesn't really change that, for whatever reason. Maybe my brain is remembering the context.