blind

suckless command-line video editing utility
git clone git://git.suckless.org/blind
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blind-set-alpha.1 (1064B)

      1 .TH BLIND-SET-ALPHA 1 blind
      2 .SH NAME
      3 blind-set-alpha - Multiply the alpha channel of a video
      4 .SH SYNOPSIS
      5 .B blind-set-alpha
      6 [-i]
      7 .I alpha-stream
      8 .SH DESCRIPTION
      9 .B blind-set-alpha
     10 reads a video from stdin and a mask video from
     11 .IR alpha-stream .
     12 The video is printed to stdout, with each alpha value
     13 multiplied by the product of the luminosity and the
     14 alpha value of the corresponding pixel and frame in
     15 the mask video.
     16 .P
     17 If stdin is longer than
     18 .IR alpha-stream ,
     19 the remainder of stdin is printed without any changes.
     20 If stdin is shorter than
     21 .IR alpha-stream ,
     22 the remainder of
     23 .I alpha-stream
     24 is ignored but may be partially read.
     25 .SH OPTIONS
     26 .TP
     27 .B -i
     28 Use the inverse luminosity of the mask video instead
     29 of the luminosity. It is still multiplied by the
     30 alpha value.
     31 .SH SEE ALSO
     32 .BR blind (7),
     33 .BR blind-single-colour (1),
     34 .BR blind-dissolve (1),
     35 .BR blind-transition (1),
     36 .BR blind-arithm (1),
     37 .BR blind-set-luma (1),
     38 .BR blind-invert-luma (1),
     39 .BR blind-set-saturation (1),
     40 .BR blind-extract-alpha (1)
     41 .SH AUTHORS
     42 Mattias Andrée
     43 .RI < maandree@kth.se >