blind

suckless command-line video editing utility
git clone git://git.suckless.org/blind
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blind-invert-luma.1 (1212B)

      1 .TH BLIND-INVERT-LUMA 1 blind
      2 .SH NAME
      3 blind-invert-luma - Invert the luminosity of a video
      4 .SH SYNOPSIS
      5 .B blind-invert-luma
      6 [-iw]
      7 .I mask-stream
      8 .SH DESCRIPTION
      9 .B blind-invert-luma
     10 reads a video from stdin and a mask video from
     11 .IR mask-stream .
     12 The video is printed to stdout, with the luminosity
     13 inverted where, in
     14 .IR mask-stream ,
     15 the product of the luminosity and the alpha value is
     16 1, and unchanged where the product is 0. For other
     17 products, the result is linearly interpolated or
     18 linearly extrapolated.
     19 .P
     20 If stdin is longer than
     21 .IR mask-stream ,
     22 the remainder of stdin is printed without any changes.
     23 If stdin is shorter than
     24 .IR mask-stream ,
     25 the remainder of
     26 .I mask-stream
     27 is ignored but may be partially read.
     28 .SH OPTIONS
     29 .TP
     30 .B -i
     31 Invert the luminosity in
     32 .I mask-stream
     33 before calculating the product of the luminosity and
     34 the alpha value.
     35 .TP
     36 .B -w
     37 Instead of using CIE Standard Illuminant D65 as the
     38 whitepoint, use the X and Z from each pixel in
     39 .I mask-stream
     40 for the whitepoint.
     41 .SH SEE ALSO
     42 .BR blind (7),
     43 .BR blind-single-colour (1),
     44 .BR blind-arithm (1),
     45 .BR blind-set-alpha (1),
     46 .BR blind-set-luma (1),
     47 .BR blind-set-saturation (1)
     48 .SH AUTHORS
     49 Mattias Andrée
     50 .RI < maandree@kth.se >