[MPlayer-users] Improving the rendering of DVD subtitles (bitmap)

Alexander Roalter alex at roalter.it
Thu Feb 26 15:36:54 CET 2009


KRS wrote:
> Hi,
> I don't know if this is the right place for wishes.
> 
> Bitmap subtitles (DVD) are ugly when displayed on a hi-def PC screen 
> despite the bilinear (bucubic?) interpolation.
> 
> A pixel upsampling algorithm would do a better job for these aliased 
> bitmap subs. Like Eagle, 2xSal or Hqnx algorithms.
> 
> Look at this page : 
> http://en.wikipedia.org/wiki/Pixel_art_scaling_algorithms
> 

Before one applying different renderings I'd suggest taking care of the
color palette for DVD subtitles would be a much more rewarding task.

As DVD subtitles come in DVD (PAL/NTSC) resolution and are composited
together with the image prior to scaling to fullscreen, I don't think
it's feasible applying a different scaling method to the subtitles than
to the rest of the movie. And fullscreen scaling is typically done in
the graphics hardware, so there's even less accessibility to it.

-- 
cheers,
Alex



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