Pure contrast inversion


    Aug 18 2011 | 2:35 am
    I have taken the image feed from the camera and turned it black and white using jit.rgb2luma and jit.op @op > @val 30.
    However, I now need to use the opposite values, so I need to flip the black and white around. What is easiest and most efficient way of doing this?
    I have tried jit.brcosa and looked at couple other methods, but the inverted image isn't perfect >> the white isn't as white..it is grainy with bits of black mixed, which wasnt present before the inversion. My entire patch depends on this being pure.
    Can anyone suggest a better way of achieving this?

    • Aug 18 2011 | 3:45 am
      you'll want to keep playing with the jit.op operations..think of your values as being 0 to 255 but you need a math operation or two to make that go the other way
      you can also play with jit.scalebias and using negative numbers to get the inverse
    • Aug 18 2011 | 1:39 pm
      Is there no object that just flips exactly what is shown?
    • Aug 18 2011 | 1:59 pm
    • Aug 18 2011 | 9:50 pm
      Awesome cheers Christopher!