[Radiance-general] Create constant radiance image

[Greg Ward]

Hi John,

You are correct -- weighting values are not applied for the <return>  
reporting in ximage, corresponding to the radiant "intensity" for this  
pixel or area.  There is no agreed-upon weighting for radiance values,  
only luminance, which is the reason for the different choices.  You  
can always divide the 'l' report by 179 if you want a photometrically- 
weighted radiance quantity.  The 'c' command reports the RGB color,  
but adjusted by the current exposure scale, which is not really useful  
as a radiometric quantity.

Cheers,
-Greg

> From: John Mardaljevic <jm at dmu.ac.uk>
> Date: January 6, 2010 2:06:35 AM PST
>
> The <return> option of ximage seems to give the maximum radiance in  
> any one channel rather than the RGB weighted value, whereas the 'l'  
> option gives the expected (RGB weighted) luminance value.  The -ov  
> option reports correctly.  Anyone else see this?
>
> Version RADIANCE 4.0a lastmod Fri 30 Jan 2009.
>
> -John