Chromatic aberration

[Mark David Williams]

A couple more

http://www.freewebs.com/markwilliams/Mark3.png

http://www.freewebs.com/markwilliams/Mark4.png

What do people think of these? Images good to go as are?

[Marlon Martins]

CA can be corrected in any software i believe.

in vegas, i triplicate the track, using color curves, let only a single color per track
put track in "ADD" mode, and you can resize the channels independently, fixing CA.

so, i let this project to fix CA. drag, and export. can use keyframes also to adjust based on zoom.

Oliver Neubert example:

[Serena Steuart]

very interesting.

[Piotr Wozniacki]

As a Vegas user, I find it VERY interesting indeed.

Marlon, could you please elaborate on how exactly you "resize the channels independently" - do you use Track Motion? I'd suspect moving one single-color track relative to another could remove the CA in one place (say at the frame extremities), but introduce color shift in another (like the frame center)...

But I'm certainly missing something!

PS Perhaps you could share your example .veg file used to achieve this?

[Marlon Martins]

yes, i use track motion, with curves filters on track also.

of course, there other ways, other filters, better workflow. but this is my first try, i just got a ex3 about a week. testing now with shneider fisheye ;)

here is the project as example. values are crude, to be perfect need more samples and tests.

[Bob Grant]

Here's another approach shamelessly borrowed from an AE tutorial elsewhere. Not without its pitfalls. The white dot is simply so I could tell how much desaturation was being done as I previewed the result at full raster.

Looking at the frame grab this doesn't look like classical CA, the amount of fringing seems too constant over the frame.

[Max Allen]

Originally Posted by Marlon Martins

yes, i use track motion, with curves filters on track also.

of course, there other ways, other filters, better workflow. but this is my first try, i just got a ex3 about a week. testing now with shneider fisheye ;)

here is the project as example. values are crude, to be perfect need more samples and tests.

Hi Marlon, could you check if you get vignetting with your Fisheye please?

[Tom Hardwick]

Originally Posted by Max Allen

could you check if you get vignetting with your Fisheye?

Er - the whole point of a fisheye lens is to place a circular 180 degree image within the rectangular gate. Now that's vignetting.

Full frame fisheyes on the other hand shouldn't obviously vignette.

[Piotr Wozniacki]

Originally Posted by Bob Grant

Looking at the frame grab this doesn't look like classical CA, the amount of fringing seems too constant over the frame.

Exactly - and this is why Marlon's method of moving the soloed red channel in relation to the other 2 channels over entire frame, actually works here!

In the case of typical CA, where it mainly shows at frame extremities, your method of adjusting color locally is more adequate - though tedious.

[Max Allen]

Originally Posted by Tom Hardwick

Er - the whole point of a fisheye lens is to place a circular 180 degree image within the rectangular gate. Now that's vignetting.

Full frame fisheyes on the other hand shouldn't obviously vignette.

Isn't the Century/Schneider full frame?

[Dave Tyrer]

I came across this video tutorial, but only for after effects - are there similar controls in Vegas ?

Removing Chromatic Aberration : Adobe After Effects Video Tutorial

[Marlon Martins]

Originally Posted by Max Allen

Hi Marlon, could you check if you get vignetting with your Fisheye please?

sure ;)

vignetting is very low, normally not perceptible.

a quick test:

[Bob Grant]

Originally Posted by Dave Tyrer

I came across this video tutorial, but only for after effects - are there similar controls in Vegas ?

Removing Chromatic Aberration : Adobe After Effects Video Tutorial

Yes. See the sample project file I uploaded above.
I used the Secondary Color Corrector to select the color of the fringe and to desaturate that color. As the tutorial also shows this can easily fail if the same color appears in other parts of the frame. Then you have to use a mask as well. That can become very tedious if you need to keyframe the mask as well.