To the best of my knowledge, -normalize is what it is. The issue is 
that it forces 2% of the dark data and 1% of the light data to be 
fully black and fully white.  Thus it will be image dependent whether 
it helps or hurts your image.

If you want to stretch an image so that its min and max values become 
black and white without burning-out this extra 2% at the low end and 
1% at the high end, you can use

convert <image> -contrast-stretch 0 <output>

Normalize is a subset of -contrast-stretch and is equivalent to 
-contrast-stretch 2%x99%

see  http://www.imagemagick.org/script/command-line-options.php#normalize





>I just started using the normalize function to normalize my images.
>It's usually very impressive and a big improvement over non-normalized
>images.  Some of the images are worse though, especially images that
>are predominantly one color, especially red.  Is the normalize
>function being improved, or is it a static sort of a function that
>either works well on an image or doesn't?
>
>- Grant
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