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Re: LCH values software?

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Re: LCH values software?

Subject: Re: LCH values software?
From: Mauro Boscarol <email@hidden>
Date: Mon, 11 Jun 2007 18:34:47 +0200

On 11 Jun 2007, at 6:14 PM, Derek Lambert wrote:

Assuming that I have LAB values is there anything that calculates C and H values automatically from LAB?
gretag? Monaco? even excel formula?

If L* is in cell B3, a* in cell C3, b* in cell D3, the Excel formula for h (hue angle) is

=IF(DEGREES(ATAN2(C3,D3))<0,DEGREES(ATAN2(C3,D3))+360,IF(DEGREES(ATAN2 (C3,D3))>=360,DEGREES(ATAN2(C3,D3))-360,DEGREES(ATAN2(C3,D3))))

and the Excel formula for C* is

=SQRT((C3*C3)+(D3*D3))

Regards

Mauro Boscarol

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