Hello, I am a new reader of the list. I am a photoshop trainer, color management and workflow consultant based in Colorado USA.
Responding to a David Rowan's posting earlier today about a standard color space, I heartily endorse the use of a standardized RGB color space for photographers and don't recommend using monitor RGB for corrections because a well-behaved RGB editing space such as Adobe 1998, ColorMatch RGB or even sRGB, equal values of R, G, and B, give you a neutral shade of gray. Since an input profile describes a particular device and how it sees the world of color, these profiles are not as well behaved and a seemingly simple adjustment, like an s-curve to add contrast through the midtones may impart a color cast where there originally was none.
Working in an input space can work in a closed-loop environment provided you understand the potential pitfalls and limitations. In a workflow requiring an open exchange of files the use of a "common" working space usually provides much better results.
Jay Kinghorn
RGB Imaging
