blind-chroma-key.1 - blind - suckless command-line video editing utility
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       blind-chroma-key.1 (1247B)
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            1 .TH BLIND-CHROMA-KEY 1 blind
            2 .SH NAME
            3 blind-chroma-key - Replace a colour range with transparency
            4 .SH SYNOPSIS
            5 .B blind-chroma-key
            6 .I key-stream
            7 .SH DESCRIPTION
            8 .B blind-chroma-key
            9 reads a video from stdin and colours from
           10 .IR key-stream .
           11 Each frame in
           12 .I key-stream
           13 should contain exactly two pixels. The colour of
           14 the first pixel, and all colours with a distance
           15 from that colour upto the same distance the colour
           16 of the second pixel has to that colour, will be
           17 turned into transparency in the video from stdin,
           18 and the resulting video will be printed to stdout.
           19 .P
           20 If the two colours in a frame from
           21 .I key-stream
           22 have the same alpha value, all matching colours
           23 will be turned into full transparency. Otherwise,
           24 the colours matching the first colour will be
           25 given the transparency specified with the first
           26 colour, all other matching colours will have
           27 a transparency between to two specified alpha
           28 values. However, if alpha value of the second
           29 colour is less than the alpha value of the first
           30 colour, twos alpha values are inverted.
           31 .SH SEE ALSO
           32 .BR blind (7),
           33 .BR blind-from-text (1),
           34 .BR blind-colour-ciexyz (1),
           35 .BR blind-colour-srgb (1),
           36 .BR blind-dual-key (1),
           37 .BR blind-primary-key (1)
           38 .SH AUTHORS
           39 Mattias Andrée
           40 .RI < maandree@kth.se >