We just watched a Brain Games episode and I am inclined to think this is a probable explanation (from the buzzfeed link):
"You know, the people who make your TV shows look good between filming and the time they hit your screen?
According to Ben, the photo — taken with a camera phone in poor lighting — casts the whites in a blue tone and mutes the gold to a darker color.
People who see blue and black are seeing the photo at face value. People who see gold and white are compensating to the photo’s lighting and aesthetic."
Also, H and I zoomed in on different areas of the dress to see if that changed our perceptions. The only one that changed was when we zoomed in on the top of the dress that is black or gold. The left half looks darker than the right half. When we zoomed in on just the right half, H saw gold instead of black.
I saw white and gold first, then blue and black. I showed my stylist and she say white and gold and thought I was messing with her when I said I could see the blue and black.
Try as I might I can't make that dress black and blue. Like every trick that people say makes it change, still white and gold. But I can easily make her dancer switch directions.
Oh it looks blue in this. Did you change the color or just put it on the llama. Someone needs to put it on a blue back ground stat!
It looks white and gold like this, to me. It looked white/gold originally to me, but after seeing the blue/black I can't get the original to look white/gold again. This is insanity.
Holy crap! It just changed to blue and black for me. I can't believe it. I was on the buzz feed site and looking at that black and blue dress and scrolled back up (like the other poster said) to the white and gold dress - and it had changed!