the description says fluid mask "mimics the way the eye, optic-nerve and brain perform visual processing". i can clearly see the edges, but fluid mask consistently misses them (tried at 72dpi, at 300dpi and at 600dpi). either fluid mask need a good pair of glasses or i'm doing something wrong. i prefer to think the latter, but i thought this is supposed to be an easy to use plugin. photos with bluescreen background works well, but that is expected.