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	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 t…
	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 < [email protected] >