MJPEG Tools Svn

o Add two new filters, with documentation: y4mtopnm and pnmtoy4m.

These are intended to (eventually) replace y4mtoppm and ppmtoy4m.
The first handles 444, MONO, and 444ALPHA YUV4MPEG2 streams, and
produces PPM, PGM, and PAM output images. The second does the
inverse.
(These do not handle 4:2:0 input; the [super/sub]sampling of
y4mtoppm and ppmtoy4m was always lousy to begin with. It's a
job better done by, say, a scaler.)