The NoIR camera module is intended for night time photography, therefore it's normal to see discolouring when using during the day/in light.
If your images are excessively tinted purple/pink, please check the suggestions below:
- AWB mode - A new setting recommended by Raspberry Pi when using the NoIR camera module: https://www.raspberrypi.org/forums/viewtopic.php?f=43&t=245994
- Camera Cable Connection - check the camera belt connection. A slightly mis-seated connection can be the cause of strange colours on camera module images.
- Remember it's the NoIR module - daytime photography colours won't look quite right as this module has been designed specifically for night photography with IR lighting