Can vignetting be added in post-production?

[robkar97]

After a tip from Zap I looked into the vignetting feature of mr photographic exposure control, and it was indeed quite nice! But the documentation is a little short.

 

Is the vignetting effect view dependent in any way, or can it be added as a post-production effect just as easily?

 

If so, it would be nice to render out a "clean" animation, then render a single white frame with the vignetting of choice and add it (using multiply?) afterwards. If the client then doesn't like it, or would like to reduce it, it would be simple to edit the vignetting effect without having to re-render the entire animation.

 

 

Robert

[MasterZap]

Yes, vignetting is just a radial gradient.

 

However, you would ideally render to floating point, not to lose information. If you render to some clamped format (8- or 16-bit) and some area of the screen is blown out to white, vignetting that in post in 8 bit will make it gray and ugly, but vignetting it in floating point will make a nice gradient into whatever color the surface that blew out really had, or, if it's sufficciently overbright, let it stay white, because even toned down, that surface would still blow out (like some bright highlight etc.)

 

/Z