Video rendering differences Nvidia/ATI

[Konstantin Svist]

Tim wrote:
> On Thu, 2007-10-18 at 19:55 +0200, Gérard Milmeister wrote:
>   
>> I noticed differences of video (XV) rendering between the nvidia on my
>> desktop and the ati on my notebook, both with the proprietary drivers.
>> http://math.ifi.unizh.ch/fedora/tmp/nvidia.png
>> http://math.ifi.unizh.ch/fedora/tmp/ati.png
>> As one can see (with magnification if necessary), the nvidia is much
>> smoother than the ati. Both screenshots have been made of a running
>> totem (gstreamer) and a zoom setting of 2:1. 
>>     
>
> That's "aliasing" differences between them.  Though I don't know whether
> that's a configuration or capability difference.  Post exactly what
> cards you have, and your xorg.conf files, and somebody may be able to
> point you in the right direction.
>
>   


Exactly.
Both nvidia and ati cards should support antialiasing, but it's not 
clear how to set it up by default.
I think your major difference is the one between desktop and laptop. 
Laptops tend to have less powerful GPUs (and usually share RAM with the 
system), so you can't expect such options to be enabled by default.
Another thing to note is that the image you posted for nvidia has fuzzy 
text, while ati version has nice and crisp text. That may just be your 
system setting, though..
BTW, why are proportions different in the two images?

Using official driver in win, there's an option to enable antialiasing 
in [video] overlays and/or 3d accelerated windows.
No idea how to enable it in Fedora, properly. I've set my mplayer to use 
video output driver gl2  "X11 (OpenGL) - multiple textures version" - 
and it applies antialiasing then. Looks very nice.


HTH