[Radiance-general] Alpha Channel - Z-Buffer Images

[Greg Ward]

Hi Kirk,

The -z option of rpict, or the "ZFILE" variable in rad input (use 
RAWFILE also) will store the z-buffer for later depth-of-field 
processing.  If you want to use Radiance for that, the pdfblur script 
should come in handy.  Usage is described in the manual pages, which 
are not repeated in the book:

	http://radsite.lbl.gov/radiance/man_html/whatis.html

-Greg

> From: Kirk Thibault <kthibault at biomechanicsinc.com>
> Date: November 10, 2004 1:47:40 PM PST
>
> Hi folks - I apologize if this is covered in the Rendering with 
> Radiance text, I am awaiting the Book Surge printing of it as we 
> speak.  Does Radiance store and/or recover the alpha channel or 
> z-buffer information for a scene and, if so, can either be output to 
> an image for compositing and Depth of Field effects in another app 
> like Photoshop?
>
> Thanks,
>
> Kirk