ATI´s correction
ATI´s procedure is slightly different from NVIDIA’s. The anti-noise function is activated in DVD (SD, MPEG 2) videos since the Catalyst 6.4. Drivers do not give access to the options of sharpening and noise correction. We have to be happy with their choice as it isn´t possible to deactivate it. We compared the quality by changing from the Catalyst 6.3 to the 6.8 (the most recent version).
We tried several monitors and it is slightly better with the latest Catalyst version. You have to focus on the image to see the improvement and right away you may see a couple of rendering differences between ATI and NVIDIA´s movies:
Matrix, ATI 
Matrix, NVIDIAIt isn´t because one seems "nicer" than the other that it is more accurate. It is always possible to change the color adjustments for videos. ATI seems to push the extremes a little more than NVIDIA probably by adjusting the gamma.
If we take a closer look, here is the result of ATI´s video with the Catalyst 6.3 (without correction), with the Catalyst 6.8 (with the correction) and of the best results with NVIDIA´s drivers and our personal adjustments:
 ATI + Catalyst 6.3 |  ATI + Catalyst 6.8 |  NVIDIA |
Let´s focus first on ATI´s images. They are at first glance identical. If you take a closer look at the little darker color scale on the cheek, however, you will see that they are softer on the Catalyst 6.8. Color transitions are less abrupt and the image is smoother. In movies, it results in a slightly less visible twinkling effect. Whether we try it with an IPS or TN monitor, videos are nicer with the Catalyst 6.8. With CRT and LCD MVA, the correction doesn´t change the image. The good thing is that at least it doesn´t degrade the already good rendering image.
ATI vs. NVIDIA: NVIDIA´s has a lower contrast. It is softer and has a lower noise level. With ISP and TN monitors, the manual correction is more efficient with the scenes tested than with ATI´s parameters. If the noise in the images bothers you, NVIDIA´s solution is more flexible and will help you to find a better adjustment than ATI’s, which is nevertheless already appreciable.
 ATI + Catalyst 6.3 |  ATI + Catalyst 6.8 |
We see on this second example that the smoothening is soft with the Catalyst 6.8. It is nevertheless existent and as we see on the cheek some of the colors have been reconstituted. Some of the plain colors areas became much more agreeable color scales, closer to what the image really should be. Once more, it is subtle but it is better than the latest version of drivers.
