Yes, you can't really make smaller pixels with this technique, you  
can just position them at smaller horizontal increments.  That's why  
it's called 'sub-pixel-positioning'.  So you can position a 1/1 pixel  
at postion 0, 1/3, 2/3 or 1, but you cannot make the 1/3 width  
vertical line you are referring to.  You may be able to get away with  
adding fractional widths to elements wider than a single pixel, I  
don't know about that (the pictures henry posted certainly seem to  
imply it).

Marcel

> From: "Raab, Andreas" <Andreas.Raab at disney.com>
>
> Thanks for all of the explanation but there is one thing I don't really 
> understand: What does actually happen to the color of an object  
that's drawn
> using subpixel rendering?! If I understand the technique correctly  
then a
> vertical line of width 1/3 would appear in different colors  
depending on the
> subpixel position. Is this correct?!