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	blind-invert-luma.1 - blind - suckless command-line video editing utility
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	blind-invert-luma.1 (1212B)
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	1 .TH BLIND-INVERT-LUMA 1 blind
	2 .SH NAME
	3 blind-invert-luma - Invert the luminosity of a video
	4 .SH SYNOPSIS
	5 .B blind-invert-luma
	6 [-iw]
	7 .I mask-stream
	8 .SH DESCRIPTION
	9 .B blind-invert-luma
	10 reads a video from stdin and a mask video from
	11 .IR mask-stream .
	12 The video is printed to stdout, with the luminosity
	13 inverted where, in
	14 .IR mask-stream ,
	15 the product of the luminosity and the alpha value is
	16 1, and unchanged where the product is 0. For other
	17 products, the result is linearly interpolated or
	18 linearly extrapolated.
	19 .P
	20 If stdin is longer than
	21 .IR mask-stream ,
	22 the remainder of stdin is printed without any changes.
	23 If stdin is shorter than
	24 .IR mask-stream ,
	25 the remainder of
	26 .I mask-stream
	27 is ignored but may be partially read.
	28 .SH OPTIONS
	29 .TP
	30 .B -i
	31 Invert the luminosity in
	32 .I mask-stream
	33 before calculating the product of the luminosity and
	34 the alpha value.
	35 .TP
	36 .B -w
	37 Instead of using CIE Standard Illuminant D65 as the
	38 whitepoint, use the X and Z from each pixel in
	39 .I mask-stream
	40 for the whitepoint.
	41 .SH SEE ALSO
	42 .BR blind (7),
	43 .BR blind-single-colour (1),
	44 .BR blind-arithm (1),
	45 .BR blind-set-alpha (1),
	46 .BR blind-set-luma (1),
	47 .BR blind-set-saturation (1)
	48 .SH AUTHORS
	49 Mattias Andrée
	50 .RI < [email protected] >