jit.object to make my video black and white?

    Oct 01 2009 | 12:35 pm
    I know that this is a question where the usual answer would be "read the reference"
    but there are so many jitter objects.. so if you could be so kind

    • Oct 01 2009 | 1:04 pm
      [jit.brcosa] saturation 0.
      [jit.unpack 4] and only use green channel (carries most luma)
      may also be able to do a similar trick using [jit.matrix] and planmap message
      here's a few different ways to get you going... the first is the easiest, the other two may offer performance advantages at the expense of flexibility... YMMV
    • Oct 01 2009 | 3:57 pm
      for grayscale you can also use jit.rgb2luma, or for pure black-and-white, try jit.op @op > @val 127 (or whatever threshold you want). the op will convert 0-255 char values to black or white, just as though they each went through a logical operator (which they did) and came out "off or on" for "false or true".