[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 

> 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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