Why can't indoor photography be purple!

First of all, CCD and CMOS are not very sensitive to violet light and ultraviolet light (as opposed to negative film), which is a congenital defect and cannot be solved.

Secondly, when the solid color part reaches a certain proportion, the automatic white balance judgment will be inaccurate. The solution is to buy a white balance lens cover with manual white balance (usually several yuan to ten yuan), which will be very helpful. Taobao sells it, which is more accurate than white paper and much cheaper than gray cards.