blind-set-luma.1 (1125B)
1 .TH BLIND-SET-LUMA 1 blind 2 .SH NAME 3 blind-set-luma - Multiply the luminosity of a video 4 .SH SYNOPSIS 5 .B blind-set-luma 6 .I luma-stream 7 .SH DESCRIPTION 8 .B blind-set-luma 9 reads a video from stdin and a mask video from 10 .IR luma-stream . 11 The video is printed to stdout, with the luminosity 12 of each pixel multiplied by the product of the 13 luminosity and the alpha value of the corresponding 14 pixel and frame in the mask video. 15 .P 16 If stdin is longer than 17 .IR luma-stream , 18 the remainder of stdin is printed without any changes. 19 If stdin is shorter than 20 .IR luma-stream , 21 the remainder of 22 .I luma-stream 23 is ignored but may be partially read. 24 .SH NOTES 25 In most cases, this is not what you want to use, instead 26 you probably want to use 27 .BR blind-arithm (1) 28 to multiple the X, Y and Z values on one value. This 29 produces the same affect as reducing the intensity of 30 the light sources, which is not what 31 .B blind-set-luma 32 does. 33 .SH SEE ALSO 34 .BR blind (7), 35 .BR blind-single-colour (1), 36 .BR blind-arithm (1), 37 .BR blind-set-alpha (1), 38 .BR blind-invert-luma (1), 39 .BR blind-set-saturation (1) 40 .SH AUTHORS 41 Mattias Andrée 42 .RI < maandree@kth.se >