Purple is the sum of mixing red and blue together. Most of the time when people feel fear they may also feel emotions that are similar to sadness or anger
While yellow is the traditional color for cowardice, Docter and crew used a richer, more vibrant version of the color for Joy, so that left purple for Fear (Bill Hader). "Fear was kind of, frankly, the leftover color
some of the difficulties is were its too dark too see what your trying to get. and a way to fix that is mayby turn on flash on your phone of get a phone that is good at taking night pictures
