help needed fixing edges (some sort of croma noise?)

[zee944]

Please take a look at these edges:

http://i179.photobucket.com/albums/w286/zee944/TD_chroma_03.jpg
http://i179.photobucket.com/albums/w286/zee944/TD_chroma_02.jpg
http://i179.photobucket.com/albums/w286/zee944/TD_chroma_01.jpg

I noticed they're some sort of chroma noise, I've read through threads about reducing them and I've played around a lot with a few chroma denoisers but I'm not even sure chroma denoisers are the best for the job, since it's probably not the fault of the original recording. The footage is taken from a DVD, the movie was shot on film originally.

ChromaShift(R=0,G=0,B=1) seems to help a little, but other color aberrations appears the same time.

Is there a filter wich doesn't shift the chrominance information, but instead searches for the edges appears to be have chroma problems and tries to fix them? I guess that would work better.

I know those edges are not that bad, but they're still annoying for my eyes. Any suggestions? :)

[Ranguvar]

I fail, I don't see anything besides squeezing and soft edges :p Could you please post a zoomed-in screen of an edge, or explain more where you see the problem? Also, please use PNG instead of JPG for screenshots - PNG is lossless.

[unskinnyboy]

If I stare real hard, I see some chroma shifting, but that's it. But I can't imagine why you are trying to move Blue to the right (and worse, converting to RGB32 in the process). If anything, I think you should shift the whole chroma to the left by a pixel or two.

[Didée]

It's some kind of chromatic aberration. When looking at vertical edges, there's a greenish halo left of the edge, and a purple halo right of it. So, just shifting all chroma in one direction won't help.

Try MergeChroma(aWarpSharp(cm=1)), and play a bit with aWarp's depth, blurlevel and thresh parameters.

[unskinnyboy]

Didée, where do you see those halos?

[Didée]

Detail from screenshot#1, zoomed 400%:

http://img229.imageshack.us/img229/9745/coloredgeld0.png (http://imageshack.us)

[zee944]

Try MergeChroma(aWarpSharp(cm=1)), and play a bit with aWarp's depth, blurlevel and thresh parameters.

Thanks, this line indeed helps. Up to this moment I had no luck adjusting the paramteres but adding the line three times totally eliminates the blue & green haloing, although at other places there are a few artifacts (e. g. the edge of the skin tone disappears).

[a uio]

Check out wikipedia's page on Chromatic Aberration caused by camera lenses. If the aberration is stronger at the edges of the frame than in the center, and "flips" color orientation on opposite sides of the frame, then that's probably what it is.

Cheers,
A

[zee944]

Just for the record, with MergeChroma(aWarpSharp(depth=32, blurlevel=1, thresh=0.5, cm=1)) I was able to achieve perfect (or near perfect) results. Thanks.

(I'll ask what more to do with these edges to fix them. They're overenhanced and blurry at the same time, I have no idea what to do with them.)