Well of course you can make the dress Blue or Black
(but I have no idea what Color Dan would pick.)
But, I see a lot of color photographs prints where people
with black hair it comes out blue.
Are all those cameras incorrect
when they output blue hair?
The blue hair is the correct color, just in the real world it's incorrect.
I sometimes like that blue hair look. It looks like a... color photo.
I like to add the color blue to white snow. To re-create a Kodak Color Moment.