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Swapping Colours


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Hello,

 

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!

 

image.thumb.png.55110d375849ab37f91365a1bd2cf7c0.png

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