> On 30 Apr 2016, at 21:37, Michael <[email protected]> wrote:
> 
> I'm trying to adjust an image, a .png file. What I want to do is a gamma 
> adjust, to lighten it.

Maybe I’m missing something, but why not use Preview? Open the PNG, select 
Tools > Adjust Color… and then save it.

Cheers,
Peter.



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