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	blind-apply-kernel.1 - blind - suckless command-line video editing utility
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	blind-apply-kernel.1 (1792B)
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	1 .TH BLIND-APPLY-KERNEL 1 blind
	2 .SH NAME
	3 blind-apply-kernel - Apply a convolution matrix to a video
	4 .SH SYNOPSIS
	5 .B blind-apply-kernel
	6 [-apPxy]
	7 .I kernel-stream
	8 .SH DESCRIPTION
	9 .B blind-apply-kernel
	10 reads a video from stdin and a convolution matrix video
	11 from
	12 .I kernel-stream
	13 and apply the convolution matrix in each frame the
	14 same frame in stdin, and prints the resulting video
	15 to stdout.
	16 .SH OPTIONS
	17 .TP
	18 .B -a
	19 Used to optimise performance if it is known that
	20 the video is opaque, and to ensure that the output
	21 video is opaque.
	22 .TP
	23 .B -p
	24 Each frame in
	25 .I kernel-stream
	26 shall contain one matrix per pixel in a frame in
	27 stdin. The width of
	28 .I kernel-stream
	29 shall be a multiple of the width of stdin, the width
	30 shall be the width of stdin multiplied by the width
	31 of the convolution matrix. The height of
	32 .I kernel-stream
	33 shall be a multiple of the height of stdin, the
	34 height shall be the height of stdin multiplied by the
	35 height of the convolution matrix.
	36 .TP
	37 .B -P
	38 Apply the convolution with first premultiplying
	39 the alpha channel.
	40 .TP
	41 .B -x
	42 When encountering the left or right edge of the video,
	43 wrap around to the opposite edge.
	44 .TP
	45 .B -y
	46 When encountering the upper or lower edge of the video,
	47 wrap around to the opposite edge.
	48 .SH REQUIREMENTS
	49 .B blind-apply-kernel
	50 requires enough free memory to load two full frames
	51 from stdin and one full frame from
	52 .I kernel-stream
	53 into memory. However, if
	54 .I -p
	55 is used, the height of
	56 .I kernel-stream
	57 divide by the height of stdin number of rows from
	58 .I kernel-stream
	59 rather than a full frame from
	60 .I kernel-stream
	61 is loaded into memory.
	62 A frame or row requires 32 bytes per pixel it contains.
	63 .SH SEE ALSO
	64 .BR blind (7),
	65 .BR blind-make-kernel (1),
	66 .BR blind-kernel (1),
	67 .BR blind-gauss-blur (1)
	68 .SH AUTHORS
	69 Mattias Andrée
	70 .RI < [email protected] >