With digital imaging technologies, the final brightness and contrast appearance of an image is due to

• A. Sensor resolution
• B. LUT (look up table) application
• C. Pixel pitch
• D. Display voltage

Answer: (B)

Brightness and contrast in a digital image come from how the sensor data is mapped to display-referred values, and that mapping is done with a lookup table. The LUT encodes a tonal response curve—often a gamma or S-shaped curve—that determines how input pixel values are transformed into output luminance. By shaping this curve, you control where shadows, midtones, and highlights fall, which directly sets the image’s overall brightness and contrast. If you apply a LUT that lifts shadow values and compresses highlights, the image appears lighter with more contrast; a different curve can produce flatter or more aggressive tonal levels. Sensor resolution and pixel pitch affect spatial detail, not how bright or dark the image looks. Display voltage relates to the hardware brightness of the screen, while the LUT defines the per-image tonal mapping that the viewer actually perceives.