If you want you can download Xtreme RGB from http://www.hutchcolor.com/profiles.html. Or you can edit an existing profile with ICC Profile Inspector from http://www.color.org/profileinspector.xalter (it is a windows program but it runs perfectly under wine). The primaries for Xtreme RGB are just 1,0,0; 0,1,0; 0,0,1. In other words, it is the identity matrix. Select Xtreme RGB for input, output, and monitor, using absolute colorimetric. As Pascal says, you are doing a totally null transform. But it does seem weird to see sRGB up there in the "input" window when you are trying to output a target shot. Regards, Elle