blind-dual-key.1 - blind - suckless command-line video editing utility
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       blind-dual-key.1 (1399B)
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            1 .TH BLIND-DUAL-KEY 1 blind
            2 .SH NAME
            3 blind-dual-key - Apply transparency to a video based on two videos and two key
            4 .SH SYNOPSIS
            5 .B blind-dual-key
            6 .I X
            7 .I Y
            8 .I Z
            9 .I dual-X
           10 .I dual-Y
           11 .I dual-Z
           12 .I dual-stream
           13 .SH DESCRIPTION
           14 .B blind-dual-key
           15 reads a video from stdin and a video
           16 .IR dual-stream .
           17 These two videos should be idential, except
           18 with two different background colours. The
           19 background colour used in the video from
           20 stdin should be specified in the arguments
           21 .IR X ,
           22 .IR Y ,
           23 and
           24 .IR Z ,
           25 using the CIE XYZ colour model. The
           26 background colour used in the video from
           27 .I dual-stream
           28 should be specified in the arguments
           29 .IR dual-X ,
           30 .IR dual-Y ,
           31 and
           32 .IR dual-Z ,
           33 using the CIE XYZ colour model. Using this information,
           34 .B blind-dual-key
           35 reconstruct the alpha channel of the video
           36 and prints the video with its alpha channel to
           37 stdout.
           38 .SH NOTES
           39 .B blind-dual-key
           40 may be changed in the future to use some other colour model,
           41 therefore, it is recommended to also use
           42 .BR blind-colour-ciexyz (1)
           43 if you are specifying the colour in CIE XYZ.
           44 .P
           45 When making a video whose transparancy is recovered with
           46 .BR blind-dual-key ,
           47 select to opposite background colours, for
           48 example black and white or green and magenta.
           49 .SH SEE ALSO
           50 .BR blind (7),
           51 .BR blind-colour-ciexyz (1),
           52 .BR blind-colour-srgb (1),
           53 .BR blind-chroma-key (1),
           54 .BR blind-primary-key (1)
           55 .SH AUTHORS
           56 Mattias Andrée
           57 .RI < maandree@kth.se >