Which digital process is applied after rescaling to adjust overall brightness/contrast following slight under- and over-exposure errors?

• A. Rescaling
• B. LUT adjustments
• C. Digitization
• D. Histogram analysis

Answer: (B)

Adjusting brightness and contrast after a slight exposure error is done by shaping the image’s tonal mapping with a look-up table. Once rescaling brings the pixel values into the displayable range, applying a LUT maps each input gray level to a specific output value, effectively moving the overall brightness and tweaking the contrast across the entire image. This global tonal adjustment helps recover detail in both shadows and highlights without altering the image’s spatial information. Histogram analysis can guide how much adjustment is needed, but the actual change in appearance comes from the LUT’s mapping.