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Layer > New Adjustment layer > Channel Mixer Adjustment would be a good option

 

or , for certain parts of the image using a selection,

Layer > New Adjustment layer > Recolour Adjustment
https://vimeo.com/178437760

 

 

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I think the question is about how to enter an RGB color code (like 255,128,0 for example) in an adjustment layer dialog. As far as I know, there is no way to do that.

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Maybe you can convert RGB values to HSL values and then use the HSL values in your adjustments

http://www.rapidtables.com/convert/color/index.htm

Not sure how accurate it is and I have never tried it, so let us know how you get on

 

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Depends on what you are changing but I’ve got round this by

 

1    Enter your new colour code in RGB etc in Colour chooser, set to front swatch

2    Select layer with colour to change, go menus Selections>Select sampled colour, adjust tolerance as required

3    Layer> new fill layer changes to chosen colour

 

Works pretty well and at least it’s non destructive, saving the selection keeps it editable, masking cleans up easily where needed.

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