[Radiance-general] HDR & Isocontour help.

[Gregory J. Ward]

Hi Chris,

If anyone should be kicked off, it's me -- I've been answering e- 
mails when I'm rushed and tired and doing a bad job of it, so  
apologies to everyone.

You are correct that the last value reported (the one with an 'L'  
next to it) in rvu is the luminance in candelas/meter^2, or nits.  To  
get illuminance instead, turn on the -i option via the "set i y"  
command in rvu then do the trace again.  You can switch irradiance  
mode off again with "set i n".

I hope this helps!
-Greg

> From: "Chris Foster" <chris.foster at npl.co.uk>
> Date: July 26, 2006 8:15:42 AM PDT
> Hi everybody...again
>
> Im a regular nuisance on here, please dont kick me off Greg!
>
> In addition to my last email, i have a query regarding light  
> measurement within radiance. When viewing an .oct in rvu if i type  
> t and then click on a point, it will give me a few values, the last  
> of which, i assume, is luminance in nits.
>
> Firstly is this assumption correct?
>
> Is there a way to measure illuminance as opposed to luminance?
>
> Thanks in advance
>
> Chris
>