[argyllcms] Re: Fluorescent patches in a profile target?
- From: Graeme Gill <graeme@xxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Thu, 25 Mar 2010 00:46:39 +1100
Ben Goren wrote:
I'm therefore wondering about the wisdom of including fluorescent patches in a
profile
target in an attempt to characterize the 100%+ range.
I'm not sure that's going to take you anywhere, because the fluorescent
response will depend on the UV content of the illuminant. This is both
hard to measure and control. Determining the expected response
of fluorescent material is very difficult without some very expensive
measurement equipment (a Bispectral Spectrophotometer).
If you are under fixed lighting conditions, why don't you simply
have a test chart a bit closer to the lighting, to make sure
that it's white reference is brighter than anything else in the scene ?
If you are not in fixed lighting, then profiling is only going to
have the flexibility desired if it is lighting level independent.
This essentially translates to processing linear light images with a matrix
profile. In this situation there is no need to have brighter than
white references. (Achieving a linear light capture may require
some sort of linearization, but this can be treated essentially
as a calibration step.)
Graeme Gill.
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