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	blind-kernel.1 - blind - suckless command-line video editing utility
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	blind-kernel.1 (3099B)
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	1 .TH BLIND-KERNEL 1 blind
	2 .SH NAME
	3 blind-kernel - Create a convolution matrix
	4 .SH SYNOPSIS
	5 .B blind-kernel
	6 [-xyza]
	7 .I kernel
	8 .RI [ parameter ]\ ...
	9 .SH DESCRIPTION
	10 .B blind-kernel
	11 creates a convolution matrix that can be applied to
	12 a video using
	13 .BR blind-apply-kernel (1).
	14 The convolution matrix is created from a set
	15 of standard formulae. The formula is selected
	16 using the
	17 .I kernel
	18 argument and is tuned with
	19 .IR kernel -specific
	20 .IR parameter s.
	21 .SH KERNELS
	22 .TP
	23 .RI ' \fBbox\ blur\fP '\ [-w\ weight ]\ [ spread \ \|\ x-spread \ y-sp…
	24 Creates a box blur kernel. Unless
	25 .B -w
	26 is used, the kernel is unweighted, otherwise it has the specified
	27 .IR weight .
	28 The kernel will have the spread 1, the specified
	29 .IR spread ,
	30 or
	31 .I x-spread
	32 as the horizontal spread and
	33 .I y-spread
	34 as the vertical spread.
	35 .TP
	36 .BR emboss \ [\fIdirection\fP]
	37 Create an emboss kernel with the specified
	38 .IR direction .
	39 The
	40 .I direction
	41 must be
	42 .BR N ;
	43 .BR NW
	44 or
	45 .BR WN ;
	46 .BR W ;
	47 .BR SW
	48 or
	49 .BR WS ;
	50 .BR S ;
	51 .BR SE
	52 or
	53 .BR ES ;
	54 .BR E ;
	55 .BR NE
	56 or
	57 .BR EN .
	58 If no
	59 .I direction
	60 is specified,
	61 .B SE
	62 is used.
	63 .TP
	64 .RI \fBgaussian\fP\ [-s\ spread ]\ [-g\ \|\ -u]\ standard-deviation
	65 Creates a Gaussian blur kernel with the standard deviation
	66 .IR standard-deviation .
	67 If
	68 .B -u
	69 is used, the a Gaussian unsharpen kernel is created.
	70 If
	71 .B -g
	72 is used, the a Gaussian blur kernel with glow effect is created.
	73 If
	74 .B -s
	75 is specified, the specified
	76 .I spread
	77 will be used, otherwise the spread will be selected automatically.
	78 .TP
	79 .BI gradient\ direction
	80 Create a gradient detection kernel with the specified
	81 .IR direction .
	82 The
	83 .I direction
	84 must be
	85 .BR N ;
	86 .BR NW
	87 or
	88 .BR WN ;
	89 .BR W ;
	90 .BR SW
	91 or
	92 .BR WS ;
	93 .BR S
	94 or
	95 .BR H ;
	96 .BR SE
	97 or
	98 .BR ES ;
	99 .BR E
	100 or
	101 .BR V ;
	102 .BR NE
	103 or
	104 .BR EN .
	105 .TP
	106 .BI kirsch\ direction
	107 Create a Kirsch kernel with the specified
	108 .IR direction .
	109 The
	110 .I direction
	111 must be
	112 .B 1
	113 or
	114 .BR N ;
	115 .BR 2 ,
	116 .BR NW ,
	117 or
	118 .BR WN ;
	119 .BR 3
	120 or
	121 .BR W ;
	122 .BR 4 ,
	123 .BR SW ,
	124 or
	125 .BR WS ;
	126 .BR 5
	127 or
	128 .BR S ;
	129 .BR 6 ,
	130 .BR SE ,
	131 or
	132 .BR ES ;
	133 .BR 7
	134 or
	135 .BR E ;
	136 or
	137 .BR 8 ,
	138 .BR NE ,
	139 or
	140 .BR EN .
	141 .TP
	142 .BR sharpen \ [-i]
	143 Creates a sharpen kernel. If
	144 .B -i
	145 is used, an intensified sharpen kernel is created.
	146 .TP
	147 .BI sobel\ direction
	148 Create a Sobel operator kernel with the specified
	149 .IR direction .
	150 The
	151 .I direction
	152 must be
	153 .BR N
	154 or
	155 .BR H ;
	156 .BR NW
	157 or
	158 .BR WN ;
	159 .BR W
	160 or
	161 .BR V ;
	162 .BR SW
	163 or
	164 .BR WS ;
	165 .BR S ;
	166 .BR SE
	167 or
	168 .BR ES ;
	169 .BR E ;
	170 .BR NE
	171 or
	172 .BR EN .
	173 .SH OPTIONS
	174 .TP
	175 .B -a
	176 Apply the values to the alpha channel, apply an
	177 identity kernel to all unselected channels.
	178 .TP
	179 .B -x
	180 Apply the values to the X channel, apply an
	181 identity kernel to all unselected channels.
	182 .TP
	183 .B -y
	184 Apply the values to the Y channel, apply an
	185 identity kernel to all unselected channels.
	186 .TP
	187 .B -z
	188 Apply the values to the Z channel, apply an
	189 identity kernel to all unselected channels.
	190 .SH NOTES
	191 .B blind-make-kernel
	192 Create a single frame, to that it can be stored to
	193 disc. When applying it to a video, you want to use
	194 .BR blind-repeat (1).
	195 .SH SEE ALSO
	196 .BR blind (7),
	197 .BR blind-apply-kernel (1),
	198 .BR blind-kernel (1),
	199 .BR blind-repeat (1)
	200 .SH AUTHORS
	201 Mattias Andrée
	202 .RI < [email protected] >