Re: L* versus rods
Re: L* versus rods
- Subject: Re: L* versus rods
- From: Graeme Gill <email@hidden>
- Date: Tue, 06 Dec 2005 12:44:12 +1100
Ken Fleisher wrote:
CIELAB is an attempt to make judgment of color differences easier to
quantify. A change of 5 L* units is supposed to be perceptually the same
whether L* 10 is changing to L* 15, or L* 80 is changing to L*85. Those
5 units should be "approximately" perceptually equal everyplace on the
scale.
An interesting claim was made by one of the speakers at the
post-CIC conference, and that was that the explanation as to
why the L* curve follows a power 3 curve rather than a log (ie.
ratiometric) curve, is the presence of "flare" (or stray light
scattering) within the human eye. Apparently if this flare is
modelled and accounted for, then the response of the receptor cells
appears to be essentially logarithmic.
Graeme Gill.
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