From the Mac OSX version of the SpectralVision Pro manual:
"ColorBurst utilizes the Epson halftone module (HM) for several printer models, including the Epson Stylus Pro 4900, 7900, 9900, and 11880. The halftone module makes linearization and ink limiting unnecessary, so the profiling process for HM printers in ColorBurst is much simpler."
So for the x900 series printers on the Mac side, you just make a new profile when you feel the need. You can't linearize or limit inks. On the PC side, those controls exist for the x900 printers
For what it is worth, I have CB running on a PC.
I adjusted Ink limits (for my objectives), re-profiled (via SpctalVision Pro), and am simply recounting what i have observed. Again... definitely worth highlighting, i know i am not an expert in these matters.
I think, going back to my original post, i am settling on Colorburst for CMYK proofing, and LR via Epson for RGB as Jeff suggested.
I would have liked to be able to use Colorburst for RGB too, for my own workflow reasons as much as anything, but unless ColorBurst can use Orange and Green more effectively (in my opinion, and based on the understanding i have attempted to explain in the rest of this thread)... i'll simply keep it for CMYK work.
I'm not sure there are very many, if any, colors that will print with only O or G i n a normal printing situation. Those inks when used correctly seem to be added in addition to the others when running out of gamut. In fact, this is what you want- oranges made from Y and LM dots are smoother and less dotty than from O dots. Same applies for Y + LC vs G. It's desirable to have those inks introduced wisely and only as needed. The only way to see those inks completely independently is with linearization printouts from a 6 channel RIP, or with a true 6 channel file dropped into same RIP, with areas using only those channels. I can do this with StudioPrint, bot have no working knowledge with Colorburst.
Hope that makes sense.
You may be right. It just seems counter-intuitive to add M&Y to Orange, at the point of establishing the separate Ink Channels (to my mind). I'd rather keep each of the colours pure, and let the profile, (or my separations) determine how to achieve certain colours. The way it appears to work at the moment seems unduly complicated, can introduce problems that are not easy to identify or address, and as far as i can tell... gives the user less control and flexibility.
Perhaps i am trying to do things that Colorburst is not meant to do?
I know that on restricted gamut printers (9800 / 9880 etc) none of these problems occur. It is just a question of how the additional colours (orange and green) are used... and wether it is optimal.
Probably only worth thinking about this at all if one of the reasons for using a 9900 is for its increased gamut.
I realise that it is completely irrelevant if all that matters is CMYK.