his example shows several image enhancement approaches. Three functions are particularly suitable for contrast enhancement: imadjust, histeq, and adapthisteq. This example compares their use for enhancing grayscale and truecolor images.-his example shows several image enhancement approaches. Three functions are particularly suitable for contrast enhancement: imadjust, histeq, and adapthisteq. This example compares their use for enhancing grayscale and truecolor images.