Re: How to get the DE 94
Re: How to get the DE 94
- Subject: Re: How to get the DE 94
- From: Rolf Gierling <email@hidden>
- Date: Tue, 21 Oct 2003 12:24:15 +0200
Hello to the list,
Bruce Lindbloom and I had a "discussion" about this off
the list not long ago. We found several sources, giving
different factors, but we haven t found the origin of
the CIE DE 94 yet.
Rolf Gierling
Johannes Hoffstadt wrote:
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Graeme,
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your factors for chroma in sc and sh gave me a start.
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You use 0.048 and 0.014, but shouldn't these read 0.045 and 0.015?
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Hanno
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Graeme Gill wrote:
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> Xabier Urien wrote:
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>>Thanks.. I know... but I'm developing an aplication (very simple) and I want
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>>to calculate the dE94 between 2 lab colors... is easy to get the dE (simple
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>>algebra) but I need the dE 94 and I dont know how...
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> Here the code from icclib <http://web.access.net.au/argyll/color.html>
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> - Graeme Gill.
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> /* Return the CIE94 Delta E color difference measure */
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> double icmCIE94(double Lab1[3], double Lab2[3]) {
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[...]
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> /* Weighting factors for delta chromanance & delta hue */
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> sc = 1.0 + 0.048 * c12;
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> sh = 1.0 + 0.014 * c12;
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> return sqrt(dlsq + dcsq/(sc * sc) + dhsq/(sh * sh));
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> }
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> }
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