[magick-developers] Using A Histogram To Auto-Determine A Gamma Adjustment

[Ed Halley]

On Sep 1, 2006, at 4:36 PM, Jason Lamey wrote:
> I've used the Histogram() function and am able to pull out a hash  
> of all unique colors and a count for each, but I'm kind of lost on  
> how to use that data, or if there's a better way of going about it.

Well, numerically, you now want to fit a gaussian peak to the bins.   
This will give you a peak position, and a width for the peak (two  
half-widths, actually).  Then choose a gamma value that will realign  
the distribution to be more centered and appropriately wide.

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