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So, I recently started working in LAB space.

My question is, if I am working in an individual channel say Lightness(only channel editable),

how do I ensure that all filters and adjustments are applied before jumping to RGB?

Because, on changing to RGB it highlights R channel only , so I am not sure how to preserve my LAB work..

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I am not sure about this but I think that depending on the filters & adjustments used, the only thing you need to be careful about is selecting RGB (16 bit) rather than RGB (8 bit) if you want to make sure there is no change to the appearance of the document. That is because Lab is inherently a 16 bit color format, so conversion to an 8 bit color format may eliminate subtle (or possibly not so subtle) color variations the filters & adjustments have added to the file.

Affinity Photo 1.8.4, Affinity Designer 1.8.4, Affinity Publisher 1.8.4;  2020 iMac 27"; 3.8GHz i7, Radeon Pro 5700, 40GB RAM; macOS 10.15.6
Affinity Photo & Affinity Designer for iPad; 6th Generation iPad 32 GB; Apple Pencil; iPadOS 13.3.1

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