Normalize

”Normalize” will convert an input image to 8-bit unsigned integers, while adjusting its contrast. This algorithm will enhance low contrast information.

At each pixel, Normalize looks at the “statistics” of the rectangular region around each pixel and linearly stretches its value to maximize the visibility. Specifying a ”window” size is required, either a width and a height, or a single number, the side of a square.

Besides 8-bit, you may convert the output to 16-bit integer values or 32-bit or 64-bit floating point values.

You may adjust the contrast of the enhancement with the “sigma” parameter. Lower numbers produce higher contrast. Default value is 3.0.