Which term describes the ability to distinguish many shades of gray from black to white?

• A. spatial frequency
• B. dynamic range
• C. contrast resolution
• D. signal

Answer: (C)

The ability to distinguish many shades of gray from black to white is about contrast resolution—the capacity to detect small differences in luminance. When contrast resolution is high, subtle brightness differences in midgray areas become visible, letting you separate objects that are close in shade.

Spatial frequency, by contrast, is about how fine the image detail or texture is—the pattern repetition per unit distance—not about how many gray levels you can tell apart. Dynamic range describes the overall brightness span a system can represent—from darkest to brightest—not the granularity of intermediate gray steps. Signal is a general term for the information carried, not specifically tied to distinguishing gray shades.