Re: Infering the Lightness Range of a device
Re: Infering the Lightness Range of a device
- Subject: Re: Infering the Lightness Range of a device
- From: "Andre Schützenhofer" <email@hidden>
- Date: Fri, 07 Dec 2001 23:01:01 +0100
But as far as estimating Lightness Range of this device, if 100/100/100/100
maps out to L=12 in the A2B1 tag then if 298% is actually the darkest tone
that the USWebCoated(SWOP)v2 represent, this means that the true Litghtness
value of 298% is certainly above L=12. But how do you compute it using the
information in the profile?
Roger,
I noticed the Lightness value of 300% depends on the selected LUT.
100-100-100-100 maps out to L*=11.77 in rel col, and the darkest tone
represented by TIL of 300% and 75-68-67-90 maps out to ca. L*=16.4. If LUT
perceptual is selected, 400% maps out to L*=0, as it does for 300% - this is
the darkest tone in the dynamic range of the gamut itself, to calculate with
relative Lightness. If LUT abs col is selected, 400% maps out to L*=9.1 and
300% maps out to L*=13.3 (paper white is calculated in and scales the other
values). Paper white is about 88. At least, the last mentioned ones should
be the real values, as similar as possible to the measured data. I found
this out using colorblind edit.
Regards, Andre Schuetzenhofer
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