David Duke reader reports a problematic color shift in iPhoto 4.0: "iPhoto displays photos, having embedded sRGB profiles, with a distinct color shift (approximately +5 to +7%R,-2 to -4%G, +3 to +5%B) ...
The circuit diagram shows two LT1398’s from Linear Technology used to create buffered color-difference signals from RGB (red-green-blue) inputs. In this application, the R input arrives via 75Ω coax.