Which of the following will result in the greatest number of shades of gray in a digital image display?

• A. Large Pixels with Many Bits Per Pixel
• B. Small Pixels with Few Bits Per Pixel
• C. Many TV Lines Per Frame
• D. High Contrast

Answer: (A)

The number of shades of gray a digital image can display is determined by how many brightness levels a pixel can represent, which is set by the bit depth per pixel. Each additional bit doubles the possible gray values, so higher bit depth dramatically increases the range of grays you can show (for example, 8 bits gives 256 shades, 16 bits gives 65,536 shades, and so on). The size of a pixel (how large it is) affects spatial resolution—the level of detail you can sample in the image—rather than how many distinct grayscale values exist for each pixel.

So a display configuration with large pixels and many bits per pixel provides both broader spatial sampling and a much larger set of grayscale levels, maximizing the number of shades of gray. The other factors don’t change the count of grayscale values per pixel: more TV lines per frame changes temporal sampling, and high contrast changes how noticeable differences appear but not the actual available gray levels.