This method performs a gradient filtering. Based on the sum of a 2 x 2 matrix in the X-and Y-direction, a gradient image is calculated and using the larger of the two components. The edges are darker than that of the method Gradient Sum.

Parameter

Description

Normalization

Defines how out-of-range pixel values are mapped.

The calculated pixel values of the output image may be out-of-range and are mapped into the available range.

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Clip

Values exceeding the pixel value range are set to the highest value available (white), values falling short of the pixel value range are set to the lowest value available (black). The effect corresponds to underexposure or overexposure. This means that in some cases information is lost.

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Automatic

Normalizes the pixel values automatically to the available pixel value range. The highest resulting value is mapped to the maximum pixel value, the lowest resulting value to 0. As a result, the whole range of resulting pixel values is compressed evenly.