A method of operating a mobile device and mobile systems are provided. The method includes detecting a first event through an interface of the mobile device, displaying scene data that is generated by a camera of the mobile device on a display of the mobile device, in response to the detecting first event, detecting a second event through the interface, and measuring an external color temperature in response to the detecting the second event. The method further includes generating flash data having a color temperature for compensating the external color temperature, displaying the flash data on the display, and capturing a scene using the camera.