Re: ISO 12647-7
Re: ISO 12647-7
- Subject: Re: ISO 12647-7
- From: "Gribunin" <email@hidden>
- Date: Wed, 23 May 2007 09:56:03 +0400
Hello!
I tried all formulas posted here in this list but all of them seems to be
wrong. I'm comparing the result of formulas with the result of CGS ORIS
Certified Proof calculation.
The only one formula which gave me zero difference comparing to ORIS
Certified Proof results on all patches (I used Ugra/Fogra MW2 scale) is dH
from http://www.brucelindbloom.com/, from Delta E94 or dECMC calculation
steps.
The formula is the following:
dH = sqrt(da^2+db^2-dC^2)
Where dC=C1-C2;
C1=sqrt(a1^2+b1^2);
C2=sqrt(a2^2+b2^2);
Best regards,
Alexey Gribunin, UNIT Color Technologies,
Moscow, Russia.
>> Delta-H* is the contribution of the hue difference to the
>> total error. It is obtained by removing the contributions
>> of Delta-C* and Delta-L* from Delta-E*:
>>
>> Delta-H* = sqrt( square(Delta-E*)- square(Delta-L*) -
>> square(Delta-C*))
>>
>> As you noted, the angular difference will vary
>> significantly for neutral tones, but Delta-H* will/should
>> not.
>>
>> I do not have ISO 12647-2 i front of me but they are most
>> likely talking of Delta-H*, not Delta-h*.
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