On 2012-11-22, at 8:25 PM, Iliah Borg wrote: > Additionally, I see clipping of the green channel on the portions of the > whitest patch of the target itself I just looked a bit closer, and I can only see a half-dozen pixels clipped in the second green channel in patch N18, and they're all outside of the BOX_SHRINK margins. There's a fair amount of clipping in the white balance target on top of the chart (a piece of Tyvek), but I'm only using that for white balance -- and, of course, I'm not getting the white balance from the clipped portion. > and general clipping on the darkest patch. Actually, that's a good sign. That's a light trap; the entire target is a one-inch-deep hollow box lined with black flock velvet, and that patch (I13) is a hole cut in the top of the target. > Shooting against bright background for profiling may add unwanted flare to > the shot. I recognize that those are your actual shooting conditions, still I > would try to profile from a shot with a dark background and see if it helps. > It certainly helped in a test I just made. Hmmm...I can try turning off the background lights for the profiling shot...still, they're contributing a fair bit of illumination to the overall scene. > Last, but not least - raw converter you used seems not fully adequate for the > task as it treats highlights in a slightly crude manner. Said converter is RAW Developer, which is supposed to use DCRAW for its processing engine. I think it does have some different options for highlight recovery...I'll see if tweaking those knobs makes any difference. b&