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	blind-set-luma.1 - blind - suckless command-line video editing utility
	git clone git://git.suckless.org/blind
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	blind-set-luma.1 (1125B)
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	1 .TH BLIND-SET-LUMA 1 blind
	2 .SH NAME
	3 blind-set-luma - Multiply the luminosity of a video
	4 .SH SYNOPSIS
	5 .B blind-set-luma
	6 .I luma-stream
	7 .SH DESCRIPTION
	8 .B blind-set-luma
	9 reads a video from stdin and a mask video from
	10 .IR luma-stream .
	11 The video is printed to stdout, with the luminosity
	12 of each pixel multiplied by the product of the
	13 luminosity and the alpha value of the corresponding
	14 pixel and frame in the mask video.
	15 .P
	16 If stdin is longer than
	17 .IR luma-stream ,
	18 the remainder of stdin is printed without any changes.
	19 If stdin is shorter than
	20 .IR luma-stream ,
	21 the remainder of
	22 .I luma-stream
	23 is ignored but may be partially read.
	24 .SH NOTES
	25 In most cases, this is not what you want to use, instead
	26 you probably want to use
	27 .BR blind-arithm (1)
	28 to multiple the X, Y and Z values on one value. This
	29 produces the same affect as reducing the intensity of
	30 the light sources, which is not what
	31 .B blind-set-luma
	32 does.
	33 .SH SEE ALSO
	34 .BR blind (7),
	35 .BR blind-single-colour (1),
	36 .BR blind-arithm (1),
	37 .BR blind-set-alpha (1),
	38 .BR blind-invert-luma (1),
	39 .BR blind-set-saturation (1)
	40 .SH AUTHORS
	41 Mattias Andrée
	42 .RI < [email protected] >