I took the night scene with a SLR. Why are all the photos I found yellow? Still reddish

This problem is caused by the automatic white balance of the machine.

The easiest way is to take a blank sheet of paper (all pictures) first, and then take this photo as a custom white balance.

You can also try other white balances, such as tungsten lamp and flash. If it is a mid-range machine, set the color temperature yourself. Under normal circumstances, 5500K will not cast color, but if it is too yellow, the color temperature will drop. You can find it by setting it slowly.

You can also shoot with RAW, and then adjust it with the software of the CD that comes with the camera or with the CRAW of PS, and the same is true.