Equalize  
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Menu:   Processing > Filters… > Enhance > Equalize  
Script:   equalize  

Use this function to enhance the contrast and dynamic range of an image by analyzing its cumulative histogram and modifying it to match a specified shape. If you choose this command, the following options will become available:

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

Output
 
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.  

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

Mode
 
Lets you choose the shape for the recalculated cumulative histogram.  
 
Select Uniform to distribute the histogram equally across the intensity scale. This mode produces a high contrast image with the highest possible dynamic range.  
Select Logarithm to concentrate the histogram at the low end of the scale. This mode increases the contrast in the light areas of the image  
Click Exponent to concentrate the histogram at the high end of the scale. This mode increases the contrast in the dark areas of the image  
Click Bell if you want to concentrate the histogram at the center of the intensity scale. This mode increases the contrast in the light and dark areas of the image.