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1x1 for RGB gives you greater flexibility when processing a data set. 1x1 chrominance data can be used to generate a synthetic luminance given each filter's spectrum when combined closely equates to a luminance filter. Its not 100% however. I often perform a synthetic lum to match a Ha lum to provide a better match with the strong Ha data set. As alluded, you can also simply use the red filtered data for luminance if captured 1x1. You simply processing the data set in a different way. Possibilities are endless.
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