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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



Affinity Photo  2.3.1

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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.

All 3 1.10.8, & all 3 V2.5.2 Mac apps; 2020 iMac 27"; 3.8GHz i7, Radeon Pro 5700, 32GB RAM; macOS 10.15.7
Affinity Photo 
1.10.8; Affinity Designer 1.108; & all 3 V2 apps for iPad; 6th Generation iPad 32 GB; Apple Pencil; iPadOS 15.7

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


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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