3ds max, render passes & gamma

[gaffer61]

Hi

 

I have been trying to set up max 2011 for a linear workflow and have set the gamma LUT settings to input 2.2 output 2.2 display 2.2 with materials and color pickers to match. On the whole this seems to be working fine. My problem occours when I use render passes, max doesn't seem to be applying any gamma to these passes when saved out. They appear gamma corrected in the frame buffer at the end of the render but those saved to file have no gamma correction. The beauty pass does though both in the frame buffer and when saved file. If I save the pass from the frame buffer it is gamma corrected. I have tried saving as both tiffs and targas with the gamma setting set to use system gamma. Even when I use the overide and alter the gamma either up or down the only file that is affected is the beauty pass. I have tried this with both mental ray and scaline renders with the same result. Is this correct and are we then to do gamma correction in the composite software or am I missing something.

[acjwalker]

I use vray and usually dont have this error, but if there is any gamma problems i just try saving it out as .exr files.

[gaffer61]

It all seems a bit of a muddle to me, if I render out some blend passes they are saved gamma corrected, same settings as the straight passes that saved without gamma correction?? Anyway Andrew your suggestion to use exr seems to work out fine all the passes I have tried have gone into the comp software with the gamma corrected as desired so I think I will just stick with this. Thanks.