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	blind-gauss-blur.1 - blind - suckless command-line video editing utility
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	blind-gauss-blur.1 (2161B)
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	1 .TH BLIND-GAUSS-BLUR 1 blind
	2 .SH NAME
	3 blind-gauss-blur - Apply Gaussian blur to a video
	4 .SH SYNOPSIS
	5 .B blind-gauss-blur
	6 [-j
	7 .IR jobs ]
	8 [-s
	9 .I spread
	10 \|
	11 -s
	12 .RB ' auto ']
	13 [-acghvy]
	14 .I sd-stream
	15 .SH DESCRIPTION
	16 .B blind-gauss-blur
	17 reads a video from stdin and a mask video from
	18 .IR sd-stream .
	19 The video is printed to stdout, with all pixels are
	20 blurred using Gaussian blur with a standard
	21 deviation calculated for each pixel individually.
	22 The standard deviation is calculated by multiplying
	23 the X, Y, or Z value with the alpha value of the
	24 corresponding pixel and frame in
	25 .IR sd-stream .
	26 The X value is used when blurring the X channel,
	27 and analogously for Y and Z. If the standard
	28 deviation is 0, the pixel is not blurred.
	29 .P
	30 If stdin is longer than
	31 .IR sd-stream ,
	32 the remainder of stdin is printed without any changes.
	33 If stdin is shorter than
	34 .IR sd-stream ,
	35 the remainder of
	36 .I sd-stream
	37 is ignored but may be partially read.
	38 .SH OPTIONS
	39 .TP
	40 .B -a
	41 Used to optimise performance if it is known that
	42 the video is opaque, and to ensure that the output
	43 video is opaque.
	44 .TP
	45 .B -c
	46 Blur the chroma only, not the luma.
	47 .TP
	48 .B -g
	49 Add glow effect.
	50 .TP
	51 .B -h
	52 Blur horizontally only. Has no affect if -v is also
	53 specified.
	54 .TP
	55 .BR -j " "\fIjobs\fP
	56 Process the video in parallel, using
	57 .I jobs
	58 processes.
	59 .TP
	60 .BR -s " "\fIspread\fP
	61 Pixels with Manhattan distances exceeding
	62 .I spread
	63 shall not affect each other. If
	64 .RB ' auto '
	65 is specified, this value is calculated from
	66 the standard deviation used to blir a pixel.
	67 If -s is not used, there will not be
	68 distance limit.
	69 .TP
	70 .B -v
	71 Blur vertically only. Has no affect if -h is also
	72 specified.
	73 .TP
	74 .B -y
	75 Use the Y value (multiplied by the alpha value) from
	76 .I sd-stream
	77 as the standard deviation all channels.
	78 .SH REQUIREMENTS
	79 .B blind-gauss-blur
	80 requires enough free memory to load three full frames into
	81 memory. A frame requires 32 bytes per pixel it contains. If
	82 .B -g
	83 is used, four full frames are required.
	84 .SH SEE ALSO
	85 .BR blind (7),
	86 .BR blind-single-colour (1),
	87 .BR blind-time-blur (1),
	88 .BR blind-make-kernel (1),
	89 .BR blind-kernel (1),
	90 .BR blind-apply-kernel (1)
	91 .SH AUTHORS
	92 Mattias Andrée
	93 .RI < [email protected] >