View Full Version : 6800's Gamma-Adjusted Sampling

07-20-04, 12:52 AM
The Intellisample process also uses gamma-adjusted sampling, taking into account the dramatic physical differences between how your eyes and monitor perceive light and color, making for much smoother and more natural edge transitions.


TR: ATI has touted "gamma-correct blending" for antialiasing in the R300 series. Does the GeForce 6800 Ultra have this feature, and if not, why not?

Tamasi: It does, and I want to be really specific about this, because there's a lot of confusion about it. There's a great deal of difference between gamma correction and gamma adjustment. What ATI does is do a gamma adjustment to gamma 2.2, which can be correct depending on your display, and that's essentially what we do, as well. Gamma correction would typically would mean you could do an adjustment to any gamma, and that would require a shader pass.


I saw in a later Tech Report review that it was in fact not enabled yet but would be in a later driver version. I dont know if gamma-adjusted AA is enabled now or not.

Alot of reviews are talking about ATI's gamma-corrected AA. Is it actually gamma-corrected or is it gamma adjusted like the nVidia REP said? What differences are there between nVidia's and ATI's AA and are those methods being used right now?

07-20-04, 12:56 AM
tbh I'd like for them to make it enabled as an option. I'm not overly fond of gamma corrected anti aliasing.

07-20-04, 01:14 AM
While it's only somewhat related, Quadro FX cards have support for gamma-correct antialiased lines. I didn't know that until I was looking through the control panel on a system I was building at work that had a Quadro FX in it.

Here's a link to a PDF about it if anyone wants to take a look.

07-20-04, 10:26 AM
Well everyone keeps calling it gamma corrected and yet there are those that say its NOT and only gamma adjusted.

Which is it for certain?