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Swapping Colours

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Firstly, apologies if this is a stupid question or if it has been answered before.


I am editing a PNG file and would like to convert a defined colour into another. For example, in the screen shot below, I would like to change any pixel that is coloured light blue, into the darker blue. 


I can obviously do this on a pixel by pixel basis, but wondering if there was automatic way to do this to the entire file with is approximately 10k x 10k pixels.


Thanks in advance!



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