In image processing, Leveling makes the dark values darker and the light values lighter. It enhances the contrast and intensity by using the histogram of the image and a color distribution-based algorithm.
There are three Leveling types in OriginPro:
This function allows you to choose the Leveling type, specify the percentage of white pixels and the percentage of black pixels. Choosing Level Report in the Leveling dialog can create a report for this function.

Example...
With the following images, we can see that the contrast is improved in the output image.
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Original image |
Output image |