African crimson-winged finch brown breast and flank markings on Asian birds are more extensive than on African birds; and African birds have less black on the crown than Asian birds (on males it often tends to be restricted to the forecrown). Male birds also differ compared to the Asian birds in that they lack the extensive pink in their uppertail-coverts, no black spots on their breast-sides; less distinct black markings on the mantle and ear-coverts and almost no red on the face. African crimson-winged finch The African crimson-winged finch ("Rhodopechys alienus"), is a pale-colored thickset finch with a heavy, dull yellowish bill. It
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