[argyllcms] Re: Using an i1 to measure FWA content?

  • From: Graeme Gill <graeme@xxxxxxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Wed, 03 Feb 2010 14:31:39 +1100

Ben Goren wrote:

Thanks. A couple quick tests show that that lines up with my ``gut instinct''
interpretation of the shoulder on the left side of the plot.

Yes, it's not too hard to figure out what to look for when you've
seen some examples. Another tell tale is that papers with FWA
in them tend to drop off pretty steeply below 420n, where the FWA
is "sucking" the short wavelength out and re-emitting it at longer
wavelengths. If you take a look at cheap office copy paper, you
will also notice that they add shading agents to it, which cause
a dip between 550 and 600nm.

Graeme Gill.

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