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| author | Øyvind Kolås <pippin@gimp.org> | 2014-03-23 02:13:26 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2014-03-25 13:48:06 +0100 |
| commit | 3e6016622e6fc5967e55d41e8074558d43bc33c0 (patch) | |
| tree | 8a6508c39c49af4f465967c3a273a597b5183ac4 /doc/scaler.texi | |
| parent | a490970af2f081d3c0ae279b561406cb583ac9e4 (diff) | |
| download | ffmpeg-3e6016622e6fc5967e55d41e8074558d43bc33c0.tar.gz | |
swscale: add two spatially stable dithering methods
Both of these dithering methods are from http://pippin.gimp.org/a_dither/ for
GIF they can be considered better than bayer (provides more gray-levels), and
spatial stability - often more than twice as good compression and less visual
flicker than error diffusion methods (the methods also avoids error-shadow
artifacts of diffusion dithers).
These methods are similar to blue/green noise type dither masks; but are
simple enough to generate their mask on the fly. They are still research work
in progress; though more expensive to generate masks (which can be used in a
LUT) like 'void and cluster' and similar methods will yield superior results
Diffstat (limited to 'doc/scaler.texi')
| -rw-r--r-- | doc/scaler.texi | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/doc/scaler.texi b/doc/scaler.texi index f043ffd5f2..23d6393883 100644 --- a/doc/scaler.texi +++ b/doc/scaler.texi @@ -112,6 +112,14 @@ bayer dither @item ed error diffusion dither + +@item a_dither +arithmetic dither, based using addition + +@item x_dither +arithmetic dither, based using xor (more random/less apparent patterning that +a_dither). + @end table @end table |