Framebuffer and Gamma

Date : Wed, 7 Jun 2006 15:28:30 +0200
To : <xsi(at)Softimage.COM>
From : "Harry Bardak" <hb_xsimailinglist(at)hotmail.com>
Subject : Framebuffer and Gamma
Hi everyone, 

After the read of Luc Eric's article on xsi-blog, I was experimenting different approach to understand the Linear color space.
I am a bit stuck in my investigation because I met probably a bug in XSi. 

If you look to these image : 
http://perso.orange.fr/harry.bardak/img/Mr_bug_Gamma_1.jpg
http://perso.orange.fr/harry.bardak/img/Mr_bug_Gamma_0455.jpg
http://perso.orange.fr/harry.bardak/img/Mr_bug_Gamma_22.jpg

When I change the gamma value on the active effects tab, I got this kind of spike. 
I guess it s a bug because it's appear only when you use mitchell or lanczos filter. 
Box, Triangle, Gauss aren't affected by that or maybe they are too soft to get theses sample. 

I don't think it's come from my computer but I'am using the last Intel dual core sytem. I don't have access to others computer so if someone can test this simple scene it would be great and we could report it as a bug to the support team. 


Harry Bardak 
TD / Compositor. 

Http://perso.wanadoo.fr/harry.bardak/ 
+33 6 76 63 35 54
+44 781 661 4147
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