Which component is most directly used to map raw pixel values to displayed shades of gray?

Which component is most directly used to map raw pixel values to displayed shades of gray?

• A. Histogram analysis
• B. Lookup table (LUT)
• C. Grayscale standard display function (GSDF)
• D. Window width (WW)

Answer: (B)

Mapping raw pixel values to displayed shades of gray is done with a lookup table. Each possible input pixel value is mapped to a specific display gray level, allowing the system to control contrast, dynamic range, and the overall appearance of the image. Window width shapes which portion of the value range is stretched across the display, effectively tuning contrast, but the actual per-pixel mapping is carried out by the LUT. Grayscale display standards and histogram analysis play roles in calibration and exposure assessment, respectively, but they don’t perform the direct pixel-to-gray mapping.

Mapping raw pixel values to displayed shades of gray is done with a lookup table. Each possible input pixel value is mapped to a specific display gray level, allowing the system to control contrast, dynamic range, and the overall appearance of the image. Window width shapes which portion of the value range is stretched across the display, effectively tuning contrast, but the actual per-pixel mapping is carried out by the LUT. Grayscale display standards and histogram analysis play roles in calibration and exposure assessment, respectively, but they don’t perform the direct pixel-to-gray mapping.