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doc/filters: add quick emboss example

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Signed-off-by: Paul B Mahol <onemda@gmail.com>
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Paul B Mahol 2013-04-11 18:27:31 +00:00
parent 04924bc923
commit ae8d435ba8
1 changed files with 6 additions and 0 deletions
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doc/filters.texi
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@ -3388,6 +3388,12 @@ Generate a fancy enigmatic moving light:
@example
nullsrc=s=256x256,geq=random(1)/hypot(X-cos(N*0.07)*W/2-W/2\,Y-sin(N*0.09)*H/2-H/2)^2*1000000*sin(N*0.02):128:128
@end example
@item
Generate a quick emboss effect:
@example
format=gray,geq=lum_expr='(p(X,Y)+(256-p(X-4,Y-4)))/2'
@end example
@end itemize
@section gradfun