Why is the picture on a white background taken by a digital camera blue?

The photos taken by digital camera on white background are blue.

It may be because the color temperature of the camera when shooting is not completely matched with the actual color temperature. Generally, in most cases, it is accurate to set the white balance of the camera to automatic mode. If you are sure that your white balance is set to automatic, and both indoor and outdoor shooting are chromatic aberration, you can manually set and adjust the white balance according to the manual of the camera you are using.

If none of these can satisfy you, you can also adjust the color temperature. The larger the value, the warmer the picture will be.

Of course, you can also use the photo shop software for post-adjustment.