Which radiographic error might cause a film to show black lines near creased corners?

The presence of black lines near creased corners on a radiographic film typically indicates that the film has been physically damaged, specifically by creasing. When film is improperly handled or folded, the creases can lead to areas of the film being exposed differently during the developing process. This results in varying densities on the film, producing the characteristic black lines where the film has been creased or folded.

In contrast to creased film, underexposure would generally lead to a uniformly light film, movement during exposure would typically result in blurriness rather than lines, and bite-wing errors are usually related to improper technique and can cause overlap or incorrect captures but not specifically black lines from creasing. Understanding the effect of handling on film quality is crucial for ensuring clear and diagnostic radiographic images.