Final answer:
Flashing in the context of photography is when flash glare occurs from a camera's flash bouncing off reflective surfaces and back into the camera lens, obscuring image details.
Step-by-step explanation:
Flashing refers to a photographic phenomenon rather than construction or mechanical processes. Using flash in photography can have an unwanted effect, known as a flash glare or flash flare. This occurs when light from the flash bounces off reflective surfaces and directly back to the camera, resulting in a bright spot of light that can interfere with the clarity of the image. For instance, when taking a picture of a painting with a flash directed toward it, the reflective nature of the paint or varnish can cause a glare that makes it difficult to see the details of the artwork.