[argyllcms] Re: Camera profiling with bracketing
- From: Nikolay Pokhilchenko <nikolay_po@xxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Fri, 25 Feb 2011 09:48:30 +0300
Fri, 25 Feb 2011 12:33:06 +1100 Graeme Gill wrote:
> Iliah Borg wrote:
> > filters veiling glare can reach 2/3 EV easily when shooting a chart. Adding
> > a simple
> > black trap (hole) to a chart allows for a good estimation of veiling glare.
> That would only work for a specialised chart though. I wonder if there is
> a more general way of estimating flare.
The general way is to compute the glare by arythmetic solver - just compute
glare value of X,Y and Z (or may be, glare value
by spectrum bands) based on known target values. When the glare value is
computed correctly, the profile dE will be
minimum.
> Is it reasonable to assume that flare decreases in line with everything
> else if the exposure is reduced ?
Yes, It's reasonable. But we shouldn't forgot the sensor bias. The bias is the
constant part of error at the darks.
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