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Non linear scaling in AE
Trying to get a plugin to remove lateral chromatic aberration without success –
I have been pulling the red and blue channels using optics compensation which improves things but not at the extreme edges. I have concluded that I need to use a non-linear scaler ( sort of like a bath tub curve in the x and y directions) which is calibrated for my lens
Any of you bright cookies know a way to do non- linear scaling in this way?
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5 Replies
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My only thought is to split the clip into it’s 3 channels using the Channel tools. Then do an optics compensation on all 3 seperately, then SCREEN them back together. Haven’t really played with the optics compensation, I guess you are saying it works linearly?
Chris Smith
https://www.sugarfilmproduction.com -
yes thats what I’m doing, but I leave the green alone since the lens is usually optimised on green
the optics comp works best on diagonal scaling but is still not quite right since the idea is to effect a refractive index change/displacement rather than a barrel/pin correction
maybe I could try a displacement map using a bw grad – but I will have to do it in 4 halves – top, bottom, left , right
unless someone has the finger on the pulse for this sort of thing
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Well, you could probably do a meshwarp, where you manually tweak the warp mesh to get the exact displacement you need.
Bar3nd
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good suggestion – i will add to the list of things to try
btw Barend if you have any pull with Adobe please ask them for CA correction in next After Effects release. They have it in Photoshop CS2 so it should be simple to port over.
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Ha! I’ll let them know 🙂
On another note: I haven’t tried the CA Corrector in PS CS2, but you could always do a batch on an image sequence in Photoshop, using its filter…
Not the prettiest solution, but it would do it for now.
Bar3nd
Forum COWmunity leader for:
ADOBE AFTER EFFECTS
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