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Negative Effect

Started by Sir Sapo Sep 7, 2006 at 7:01 PM 1 reply 1.9k views

Original Post

Sep 7, 2006 at 7:01 PM

Hey everyone, I was wondering, if there was any way to create a negative colors effect in OpenGL. I'd like to have an effect like the one I doctored below, but I'm not sure where to start. Before:

After

Thanks in advance.

OrangyTang

333

OrangyTang

Sep 7, 2006 at 7:03 PM

You can do this by blending a fullscreen quad with the correct blend function. IIRC you need glBlendFunc(GL_ZERO, GL_ONE_MINUS_DST_COLOR).

arbuckle911

Sep 9, 2006 at 3:14 AM

or use a shader to swap rbg around.

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