[Radiance-general] pcomb

[Giulio Antonutto]

Tarik
What I would suggest is to render the box with -av 100 100 100 -ab 0,
without light sources (should be really quick).
After that perform a multiplication of the image with the white box and the
one with the box and the room together.
Since where is black is 0, you should have just the box at the end by
filtering: 

Pcomb -e 'lo=if(li(1)*li(2),li(1),0);' room whitebox > final

Or
-e 'ro=if(ri(1)*ri(2),ri(1),0); go=if(gi(1)*gi(2),gi(1),0);
bo=if(bi(1)*bi(2),bi(1),0)'


hope it works,
giulio


BTW Check that the luminance is the same at the end.


-----Original Message-----
From: radiance-general-bounces at radiance-online.org
[mailto:radiance-general-bounces at radiance-online.org] On Behalf Of Tarik
Rahman
Sent: 12 April 2005 14:26
To: Radiance general discussion
Subject: [Radiance-general] pcomb

Hi there
I'm working with pcomb ; I have 2 images, one with a box in a room and one
with
the empty room. I just want the box so I subtract the empty room but the
result
doesn't seem to look like the box in the first picture, it's much brighter
in
some areas and much darker in others. Am I missing something?
Thanks for any help

Tarik

--
Tarik Rahman
PhD student, Institute of Perception, Action and Behaviour
School of Informatics
University of Edinburgh

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