blind-set-alpha.1 - blind - suckless command-line video editing utility | |
git clone git://git.suckless.org/blind | |
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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 < [email protected] > |