pdftops and pdftocairo are both from poppler.
pdftops is based on the original xpdf code and does not use cairo at all.
modern cairo tries to limit the size of tranparency groups to just where it is needed.
pdftops and pdftocairo are both from poppler.
pdftops is based on the original xpdf code and does not use cairo at all.
modern cairo tries to limit the size of tranparency groups to just where it is needed.