I think that would be plain old photo-lithography.
Thin aluminium sheets with a photo-sensitive ink-resist layer are exposed like a photo print to light from the negative. The resist layer is rinsed away where not exposed. The part without resist can pick up ink, the plate is inked and used to print the album covers.
Newspapers and magazines are printed using this method. Where there is color photography the printing is typically done with four separate printing steps, cyan, magenta, yellow, black.