Michael Niedermayer (12022-08-04):
> You seem to describe samples as rectangular areas of constant value IIUC.
> If you look at the ITU/ISO specs (mpeg2, h264 or others) they are described
> by point samples. The desity of samples matches. While the default locations
> do not.
> What you list above are where probably most sane people would place the
> samples. But ISO/ITU, probably because of historic TV standard reasons and
> interlacing convertion reasons place the chroma samples in a more crooked way
> I think either the ascii art should be adapted or the text should clarify
> this difference

I am not sure what exactly you explain.

The picture represents memory cells and how we think of them when we
implement generic functions, for example cropping or drawutils. Do we
need to fix all this code somehow?

Regards,

-- 
  Nicolas George