Which factor most directly affects the total number of grayscale steps in a digital image?

• A. Frame rate
• B. Screen diagonal size
• C. Bit depth
• D. Color temperature

Answer: (C)

The number of grayscale steps is determined by how many brightness levels you can encode per pixel, which is set by the bit depth. Each pixel’s brightness is stored as a binary value, and the total grayscale levels equal 2 raised to the number of bits used. For example, 8-bit grayscale provides 256 distinct shades, while 16-bit grayscale provides 65,536 shades, allowing much finer gradations. Increasing bit depth directly increases the total grayscale steps and reduces quantization artifacts. The other factors don’t control these levels: frame rate affects temporal refresh, screen diagonal size changes image size, and color temperature relates to white balance, not the count of grayscale steps.