Using a display as a light source

A computing system, comprising:

• one or more processors;
• and
• one or more non-transitory computer-readable devices including instructions that, when executed by the one or more processors, cause performance of operations including:
• presenting, by a display of a computing device, a user interface;
• receiving, by the computing device, a request to capture an image that includes a subject in a physical environment of the computing device, using a camera of the computing device;
• determining, by the computing device, a color mix of the user interface that illuminates the subject in the physical environment during the capture of the image, wherein determining the color mix of the user interface includes the computing device analyzing the user interface to determine an average or dominant color of the user interface;
• determining, by the computing device, a complementary color for a light source that includes a graphical interface element generated by the display to illuminate the subject in the physical environment during the capture of the image and to compensate for the color mix of-the user interface illuminating the subject in the physical environment, wherein determining the complementary color includes determining a color that is complementary to the color mix of the user interface;
• concurrently presenting by the computing device on the display,
• the user interface having the color mix and the light source emitting the complementary color such that the user interface and the light source both illuminate the subject in the physical environment, and the complementary color of the light source reduces a color effect on the subject from the color mix of the user interface illuminating the subject;
• and
• receiving, by the computing device, the image that is captured by the camera of the computing device while the computing device is concurrently presenting on the display the light source having the complementary color and the user interface having the color mix.