[Radiance-general] Luminance to RGB

[Ji Zhang]

Hi, Steph,

Not sure if it's helpful but please refer to Axel Jacob's tutorial in page
40 (
http://www.jaloxa.eu/resources/radiance/documentation/docs/radiance_cookbook.pdf
).

According to Axel, the illuminance value (lux) of a point is calculated by
using the following formula:
Illuminance = 179*(R_irradiance*.265 + G_irradiance*.67 + B_irradiance*.065)


I'm not sure if a Luminance value can be converted and split back into RGB
radiance values.

So, maybe the experts here can give you more clearer advices.

- Cheers, Ji



On Thu, Jul 7, 2011 at 11:57 PM, Art Cygne <artcygne at yahoo.com> wrote:

> Hello
>
> I need to make the conversion of Luminance values (cd/m2) to the RGB colors
> to write-in Radiance...
>
> Can anyone give me a hint of this basic question?
>
> Thanks in advance.
>
> Steph
>
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