What is the effect of automatic rescaling in digital projection radiography?

• A. Normalizes overexposed images
• B. Increases image noise
• C. Decreases resolution
• D. Adds color

Answer: (A)

Automatic rescaling changes how the image’s grayscale values are mapped to the display range, using the histogram of the captured data to fit the full displayable range. When an image is overexposed, many pixels clip at the high end, washing out detail. Rescaling remaps those values so the darker and mid-tone details become visible again, effectively normalizing the appearance across different exposure levels. This is a display-side adjustment, not a change to spatial resolution or to color, and it doesn’t inherently increase image noise; it mainly improves brightness and contrast consistency for overexposed images.