Overexposure will reduce the contrast resolution of the image.

• A. True
• B. False
• C. No effect
• D. Only with certain grids

Answer: (A)

Contrast resolution depends on how many distinct gray levels the system can display, which hinges on the detector’s dynamic range. When exposure is excessive, the brightest areas of the image can reach saturation, meaning their pixel values hit the maximum allowed by the detector. Once saturation occurs, those regions cannot represent any lighter differences, so subtle gradations in brightness are lost. This clipping reduces the number of distinguishable brightness levels in the overexposed areas, effectively lowering the image’s contrast resolution. So, while higher exposure can reduce noise, pushing exposure into saturation diminishes the ability to distinguish small differences in brightness, making overexposure reduce contrast resolution.