<Each of these conversions results in clipping of the
histogram at each end, most notibly at the black end.
It does not seem to matter if the rendering Intent is changed to perceptual or
if Black Point Compensation is switched on or off.>
I would think this would simply be a result of the mapping
from the gamut of the scanner to that of the working space. Even with a larger
space such as ProPhoto, there is likely data that needs to be mapped from the
scanner space, and that would alter your histogram, no?
<Try converting to Lab instead from your custom scanner profile. I know it
does not sound logical but please give it a try. Converting to Lab should
not get you any clipping, IMO.>
You shouldn’t get any clipping, but your histogram
will certainly change as it’s now based on Lab instead of RGB.
<Once you got your image in Lab in Photoshop, try converting it to RGB, RelCol, and see if you
still get any clipping.>
This would get you identical results to that of converting directly to the working space would it not?
mike
Michael Eddington
North American Color, Inc.
www.nac-mi.com