blind-square-gradient.1 - blind - suckless command-line video editing utility
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       blind-square-gradient.1 (1781B)
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            1 .TH BLIND-SQUARE-GRADIENT 1 blind
            2 .SH NAME
            3 blind-square-gradient - Generate a video with a square gradient
            4 .SH SYNOPSIS
            5 .B blind-square-gradient
            6 -w
            7 .I width
            8 -h
            9 .I height
           10 .SH DESCRIPTION
           11 .B blind-square-gradient
           12 prints a video with a square gradient to stdout,
           13 parameters for each from is read from each frame
           14 in stdin. The gradient is stored in all channels
           15 of the video.
           16 .P
           17 The video in stdin must contain exactly 2 or 3
           18 pixels per frame. The first pixel shall point to
           19 the beginning of the gradient (where the value is
           20 0) and the second pixel shall point to the end of
           21 the gradient (where the value is 1). In these
           22 pixels, the value of the first channel specifies
           23 the X-position and the value of the second
           24 channel specifies Y-position, the other channels
           25 are ignored.
           26 .P
           27 If there is a third pixel, in frames in stdin,
           28 the value of the second channel (the Y channel)
           29 is used to modify the shape of the square, making
           30 it rectangular; the other channels are ignored.
           31 The axis perpendicular to the vector between
           32 the beginning and end of the gradient is divided
           33 by this value.
           34 .SH NOTES
           35 Pixels after the end of the gradient have values
           36 larger than 1.
           37 .BR blind-*-wave (1)
           38 commands can be used to put all values between
           39 0 and 1.
           40 .SH OPTIONS
           41 .TP
           42 .BR -w " "\fIwidth\fP
           43 The width of the video, in pixels.
           44 .TP
           45 .BR -h " "\fIheight\fP
           46 The height of the video, in pixels.
           47 .SH SEE ALSO
           48 .BR blind (7),
           49 .BR blind-from-text (7),
           50 .BR blind-cone-gradient (1),
           51 .BR blind-linear-gradient (1),
           52 .BR blind-radial-gradient (1),
           53 .BR blind-spiral-gradient (1),
           54 .BR blind-double-sine-wave (1),
           55 .BR blind-round-wave (1),
           56 .BR blind-sawtooth-wave (1),
           57 .BR blind-sinc-wave (1),
           58 .BR blind-sine-wave (1),
           59 .BR blind-triangular-wave (1),
           60 .BR blind-spectrum (1)
           61 .SH AUTHORS
           62 Mattias Andrée
           63 .RI < maandree@kth.se >