This function calculates the logarithm of the Input image pixel by pixel and generates the Output image.

To work useful with this function, the pixel values of the input image must be in float format. If images of type 8 bit, 16 bit, 24 bit and 48 bit are used as input image, the output images are of the same type, i.e. the output value will be clipped to an integer value. Negative values are set to 0, values higher than the maximum gray value are set to the maximum possible gray value of the image.