Re: ISO 12647-7
Re: ISO 12647-7
- Subject: Re: ISO 12647-7
- From: "Fleisher, Ken" <email@hidden>
- Date: Mon, 21 May 2007 11:22:43 -0400
- Thread-topic: ISO 12647-7
I should add the following notes (From Brude Lindbloom's site):
Implementation Notes:
1. H is in degrees, not radians.
2. If H < 0°, add 360° to it.
3. If H 360°, subtract 360° from it.
4. In computing H, be careful with the inverse tangent since a could be
zero. Instead, use special math functions to do this. In both the Standard C
library and Java, this function is called atan2. In Microsoft Excel, it is
called ATAN2. These special functions will compute the proper inverse
tangents without needing to worry about "divide by zero" conditions.
On 5/21/07 11:20 AM, "Fleisher, Ken" <email@hidden> wrote:
> Delta H is a specific calculation:
>
> H = Tan^-1 (b/a)
>
> (That's inverse tangent). So delta H is a simple difference.
>
> Delta H = H(2) - H(1)
>
> Ken
>
>
> On 5/21/07 11:02 AM, "Lee Badham" <email@hidden> wrote:
>
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