[argyllcms] XYZ and wavelength interval

  • From: Matthieu DUBAIL <matthieu.dubail@xxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Mon, 28 Jun 2010 19:13:48 +0200

Hi everybody,
I'm looking for an answer I didn't found on my books or internet.
I'm trying to compute the XYZ and luminous flux from spectral data of a
lightsource (taken from argyll and a colormunki).
Since I cannot compute true integrales, I'm using sum products: every
radiant intensity beeing multiplied  with color matching functions of the
same wavelenght. Then, all products are summed.
My problem is that the sum product will clearly depends on the wavelenght
interval. I'll get higher XYZ if my wavelenght intervall is 5nm than with
Then how could I get normalized luminance from that?
Sorry if this seamed to be a stupid question,
Thanks by advance,
Matthieu DUBAIL

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