Which factor is NOT a primary image quality factor influencing reliability of virtual defect detection?

• A. Resolution
• B. Focus
• C. Exposure
• D. Color balance

Answer: (D)

Detecting defects reliably hinges on how clearly the image communicates surface details. Resolution governs the fineness of detail you can see; if it’s too low, tiny cracks or texture changes may be missed. Focus determines sharpness; a little blur can wash out edges and textures that signal flaws. Exposure controls brightness and contrast; proper lighting prevents shadows or blown-out areas that hide defects or create misleading signals. Color balance, while important for accurate color reproduction in some tasks, isn’t a primary factor for defect detection because most cues come from shape, edges, and texture rather than color accuracy.