Doing that is unlikely to be required in PS isnt it ?.
Taking seperate LRGB images means they all need to be aligned, which is normally done in a stacking astro app, which automatically resizes the images to the same size. Then the same-size aligned images are taken to PS.
If you are resizing in PS, presumably the LRGB images are un-aligned, are you then aligning in PS?. Thats difficult, and not usual proceedure.
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