hello

how would i go about inverting a RGB signal? inverting in the way that red, green and blue becomes cyan, magenta and yellow.

as far as i understand the -300mV to 0V part of the signal is the sync and should stay untouched and the 0V to 700mV part is the actual video information, and could be inverted.

question is, how do you invert only parts of a signal?

by using an opamp, i suppose i could invert it so it goes from -700mV to 300mV, then feed it +1V and end up having the whole signal inverted -300mV to 700mV, but then the sync part is 'lost'.. right?

 

hello

how would i go about inverting a RGB signal? inverting in the way that red, green and blue becomes cyan, magenta and yellow.

as far as i understand the -300mV to 0V part of the signal is the sync and should stay untouched and the 0V to 700mV part is the actual video information, and could be inverted.

question is, how do you invert only parts of a signal?

by using an opamp, i suppose i could invert it so it goes from -700mV to 300mV, then feed it +1V and end up having the whole signal inverted -300mV to 700mV, but then the sync part is 'lost'.. right?

Inverting red does not give you cyan.
Inverting 0-100% red will give you 100-0% red.

To generate cyan you need to remove red and mix green and blue.

 

Inverting red does not give you cyan.
Inverting 0-100% red will give you 100-0% red.

are you saying that by inverting like this, it would result in a negative image?

To generate cyan you need to remove red and mix green and blue.

that makes perfect sense...

 

Yes.
If you have 100% red, 0% green, and 0% blue, and you invert all,
0% red, 100% green, and 100% blue will give you cyan.

 

So, I would actually be able to do it, following this idea: https://forum.allaboutcircuits.com/threads/theoretical-design-rgb-matrix-mixer.163981/#post-1441332 ?