gradfun: add notice from the MPlayer manual

Add notice telling that the filter is designed for playback only.
14 years ago · da3534b01e
parent 2ccbb3428b
commit da3534b01e
1 changed files with 4 additions and 0 deletions
--- a/doc/filters.texi
+++ b/doc/filters.texi
@ -585,6 +585,10 @@ regions by truncation to 8bit colordepth.
 Interpolate the gradients that should go where the bands are, and
 dither them.

+This filter is designed for playback only.  Do not use it prior to
+lossy compression, because compression tends to lose the dither and
+bring back the bands.
+
 The filter takes two optional parameters, separated by ':':
@var{strength}:@var{radius}