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Pure contrast inversion

August 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?


August 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


August 18, 2011 | 1:39 pm

Is there no object that just flips exactly what is shown?


August 18, 2011 | 1:59 pm
– Pasted Max Patch, click to expand. –

August 18, 2011 | 9:50 pm

Awesome cheers Christopher!


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