blind-set-alpha.1 - blind - suckless command-line video editing utility
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blind-set-alpha.1 (1064B)
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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 >