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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 /libswscale/utils.c | |
| 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 'libswscale/utils.c')
| -rw-r--r-- | libswscale/utils.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/libswscale/utils.c b/libswscale/utils.c index f2e41671a7..483b0b24e9 100644 --- a/libswscale/utils.c +++ b/libswscale/utils.c @@ -1250,7 +1250,7 @@ av_cold int sws_init_context(SwsContext *c, SwsFilter *srcFilter, if (c->dither == SWS_DITHER_AUTO) c->dither = (flags & SWS_FULL_CHR_H_INT) ? SWS_DITHER_ED : SWS_DITHER_BAYER; if (!(flags & SWS_FULL_CHR_H_INT)) { - if (c->dither == SWS_DITHER_ED) { + if (c->dither == SWS_DITHER_ED || c->dither == SWS_DITHER_A_DITHER || c->dither == SWS_DITHER_X_DITHER) { av_log(c, AV_LOG_DEBUG, "Desired dithering only supported in full chroma interpolation for destination format '%s'\n", av_get_pix_fmt_name(dstFormat)); |