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I need to be able to do very specific stuff like :

-inside the selection, select pixels that have a color saturation above a treshold X, 
-then replace those pixels with the average pixel that have a color saturation below threshold X in a radius of Y

Basically this removes colors on a gray background. Do you know if it's possible to program such a filter in photoshop ? Or maybe there is an existing filter that does that ?

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  • Yes its possible.
    – joojaa
    Apr 26 '16 at 11:25
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Here's a list of free plugin about color correction, maybe you will find what you want :

http://color-correction-plugin-for-photoshop.en.informer.com/

I know it's easier using the GIMP beceause of the scripting console, but it requires programmation skills. Also check this website later* if you are interested in creating your own script :

http://tomkrcha.com/?p=3896

*it seems the website is down for the moment

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