Vignetting corrector plugin

[angularvelocity]

Hi there,

I was wondering if there is an easy way of fixing the vignetting in the video when using a lens adapter, using software like after effects ?

I searched the net to find a really nice plugin for photoshop that will brighten the edges to reduce the vignetting effect.

http://epaperpress.com/ptlens/

Is there any good plugin for after effect that can automate vignetting correction ?

thanks.

[racer-x]

I don't use AE, but this should be easy to do manually with a feathered mask you can make in Photoshop or equivalent.

The idea is to duplicate the track. Brighten one of the tracks using Levels, Curves, or "screen mode" compositing. Then create a feathered mask in Photoshop to expose the brightened video through the dark areas of the vignetting.

Very simple to do and there is an old thread on this forum about it somewhere.

[angularvelocity]

ok, thanks, i will give it a try. but i was really looking for some plugin in which i can enter some details like focal length and radius of vignetting to fix things automatically.

i will search the forum for more details

[RusstheDutch]

Doesn't the After Effects Lens Blur plugin also deal with things like purple fringing and vignetting?

[angularvelocity]

I dont know. There are tons of articles on applying vignetting effects. But i could hardly find any article discussing removal of vignetting created by lens adapters.

[PTravel]

I would think the easiest way to fix vignetting is simply to "zoom" the clip a bit in post -- easily done in Premiere Pro. You will, of course, lose quality, but there's no other way around it if you want full-frame.

[angularvelocity]

thanks guys. I dont use premiere. I am a vegas fan

But i thinks this zoom trick can easily be applied in vegas too.

There are photoshop plugins for removal of vignetting in photos. They remove the vignetting by brightening the edges. Since there are plugins for photoshop, i thought that there must be some plugins for AE too.

unfortunately, i could'nt find any plugins for AE after searching a lot. I will try the manual way ...

[derkoi]

You used to be able to use some photoshop plugins in after effects. Give it a try.

[racer-x]

Worst case scenario:

1) Export source as image sequence.
2) Create a path in Photoshop to process all frames using your vignette plugin and save as new image sequence.
3) Import new image sequence into your Video Editor.

Rotoscoping in it's basic form..........

[Khaver]

With the lens adapter on, 100% zebra on, shoot a white wall or piece of paper. Turn your exposure down just until no zebras show. Capture this footage and take a screen shot. In any image processing app make it a negative image and save. In Vegas use this image as an overlay, setting it to "add" or whatever (I don't have Vegas). This should brighten the area of the vignette exactly opposite to how the lens adapter darkend the footage.

[angularvelocity]

wow ! photoshop batch processing of images, and khaver's negative image overlay idea .... you guys are amazing

both seem nice ideas. but i think with so many people using lens adapters, there is definately a market for vignetting removal plugin for ae

[racer-x]

Actually, I would be very surprised if there wasn't a vignetting correction plugin somewhere. I would think someone would have made one for Virtualdub or Avisynth by now. I know there are Barrel Distortion / Pincushion correction plugins out there for Avisynth and probably Virtualdub also.

I don't use lens adapters, so I never had a need for one yet.

[racer-x]

Here's something I googled up:
http://neuron2.net/hotspot/hotspot.html

It's a Virtualdub filter that looks like it might work. You still need to make the mask. khaver's idea should do the trick for that.

[Lightloch]

In Vegas Pro I simply use the zoom trick slightly and problem solved. Any quality loss isn't too terribly noticeable either since I usually render the native 1440 footage into 720p anyways.