Purple finch There are two subspecies of the purple finch, "H. p. purpureus" and "H. p. californicus". "H. p. californicus" was identified by Spencer F. Baird in 1858. It differs from the nominate subspecies in that it has a longer tail and shorter wings. The plumage of both males and females is darker, and the coloration of the females is more greenish. The bill of "C. p. californicus" is also longer than that of the nominate subspecies. Adults have a short forked brown tail and brown wings and are about in length and weigh . Adult males are raspberry red on the
Purple fringing usually attributed to chromatic aberration as described above, although it is not clear that all purple fringing can be explained this way. Other attributed causes of purple fringing in digital photography include many hypothesized sensor effects: Commonly advocated methods of avoiding purple fringing include: Post-processing to remove purple fringing (or chromatic aberration in general) usually involves scaling the fringed colour channel, or subtracting some of a scaled version of the blue channel, or other blue-channel tricks. Purple fringing In photography (particularly digital photography), purple fringing (sometimes called PF) is the term for an unfocused purple or magenta "ghost" image on