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	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] >