[HDRI] calibrating HDR pictures with real world luminance

[Gregory J. Ward]

No problem.  I also meant to respond to Christian's question about  
color gamut.  While it's true that some colors may fall outside the  
RGB gamut of sRGB and/or Radiance RGBE files, this is mostly  
restricted to saturated purples and aquamarines.  Red, orange, and  
fairly saturated green are well-covered in an HDR image.  If you want  
to capture a larger color gamut, I recommend shooting in Adobe RGB if  
your camera supports it or shooting RAW and converting to Adobe RGB  
in Photoshod, then combining exposures with the latest version of  
Photosphere (1.6.5), writing the file out either as OpenEXR or TIFF  
to avoid gamut clamping.  (Versions before 1.6.3 dated 8/19/2006  
didn't support Adobe RGB properly.)

-Greg

> From: "Bernhard Vogl" <bvogl at gmx.at>
> Date: September 27, 2006 9:47:33 AM BDT
>
> GRegory,
>
> Thanks for your elucidation about WB! Now i'm able to understand my  
> 'observations' :-)
>
> Regards
> Bernhard