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Menu:   Processing > Filters… > Enhance > Normalize  
Script:   normalize  

Use this function to enhance the contrast of an image by normalizing its histogram. Pixel values are linearly scaled to the full dynamic range of the intensity scale of an image. You can clip the dark and bright tails of the histogram in order to exclude scattered noise pixels from the rescaling.

If you choose this command, the following options will become available:

Displays the input image frame number. If you want to process another image, type or select the corresponding value.  

Displays the number of the frame in which the output image will be created. Depending on the Preferences. ImageWarp will set it either to the first available value or to the Input frame number. Type or select another value if you want the output image to be created in a different frame.  

Select this check box to watch the Preview of the output image.  

Lets you adjust the percentage of dark and bright pixels on both ends of the histogram that are excluded from normalization. Increasing this value will increase the contrast of the image.