blind-square-gradient.1 (1781B)
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 >