Separate each color component, save them as a PNG32 (R8G8B8A8).
magick input.png -channel R -separate PNG32:component_r.png
magick input.png -channel G -separate PNG32:component_g.png
magick input.png -channel B -separate PNG32:component_b.png
magick input.png -channel A -separate PNG32:component_a.png
Reconstruct a image from separated components, save it as a PNG32.